Beamer Layouting a Frame multiple Minipages

Question

I do try to realize a given structure of a presentation in Latex beamer. As a minimum working example I wrote the following code:

I want to structure my frame as shown in the image:

The dimensions are mostly written inside the sketched boxes. Some boxes are not fitting the written size. For example, 0.6 (left column) and inside two column (0.3 each). I don't know there would be no space left but for easier understanding I would not choose to sketch 100 percent exact.

I'd try to use minipages with columns. As shown here:

Creating two columns in beamer

How to get minipages in a Beamer presentation?

Neither the use of minipage or columns, nor the combination of both worked for me.

The best try I got at the moment is shown in code:

\documentclass[10pt]{beamer}
\mode<presentation>
{
    \usetheme{Montpellier}
\setbeamercovered{invisible}

}
\usepackage[utf8]{inputenc}
%\usepackage[english]{babel}
\usepackage[T1]{fontenc}
\usepackage[absolute,overlay]{textpos}
\usepackage{booktabs}
\usepackage{tikz}
\usepackage{tikz}
\usepackage{pdfpages}
\usepackage{pgfplots}
\pgfplotsset{compat=1.12}
%\usepackage{showframe}
\usepackage{caption}
\begin{document}
\title{My title}
\author{My name}
\institute{My institute}

\begin{frame}
\vfill
\begin{columns}[T,onlytextwidth]
    \begin{column}{.6\textwidth}
        \begin{block}{
                \begin{center}
                    \small{Example text}
                \end{center}
            }
        \end{block}
        \begin{minipage}[c][3.5cm][c]{0.3\textwidth}
            \begin{center}
                \begin{figure}
                    tikz figure
                      \captionsetup{justification=centering,labelformat=empty} 
                    \caption{{\centering \tiny{caption for graph 1}}}
                \end{figure}
            \end{center}
        \end{minipage}
        \hspace{1.5cm}
        \begin{minipage}[c][3.5cm][c]{0.3\textwidth}
            \begin{center}
                \begin{figure}
                    tikz Figure 2 
                    \captionsetup{justification=centering,labelformat=empty} 
                    \caption{{\centering\tiny{caption for figure 2}}}
                \end{figure}
            \end{center}
        \end{minipage}
    \end{column}
    \hspace{0.5cm}
    \begin{column}{.4\textwidth}
        \begin{block}{
                \begin{minipage}{0.4\textwidth}
                    \begin{center}
                        \scalebox{0.45}{    
                            \vbox{%
                                \underline{sdsdsdsdsd}: 
                                \begin{align*}
                                    K_{index} &amp;=  1  \\   
                                    \Delta &amp;=    1 _{142 }  \\ 
                                    P_{information} &amp;=  1  \\   
                                    \Delta &amp;=   1 _{456 }  \\ 
                                    P_{index} &amp;=  288  \\   
                                    \Delta &amp;=   2 _{789 }  \\
                                \end{align*}
                            }
                        }
                    \end{center}
                \end{minipage}
            }
        \end{block}
        \vfill  
        \begin{minipage}{0.4\textwidth}
            \begin{center}
                \begin{tiny}
                    \begin{itemize} 
                        \item adadad  
                        \item sdssdsd 
                        \item sdsdsdsd
                    \end{itemize}   
                \end{tiny}  
                \begin{figure}
                \end{figure}
            \end{center}
        \end{minipage}
    \end{column}
\end{columns}
\vspace{0.1cm}
\begin{minipage}[c]{\textwidth}
    \vbox{% 
        {\tiny
            \begin{itemize}
                \item  adsdsdsd
                \item  sdsdsdsdsd
                \item  sdsdsdsd 
                \item  sdsdsdsdsdsd
            \end{itemize}
        }
    }%

\end{minipage}

\end{frame}
\end{document}

Problems using this code:

1. tkiz figures are not really centered inside minipages
2. Captions are too far away from tikz figure (plots)
3. Captions are not centered (wrong use of centering)
4. The itemize on the right larger block is too small in width
5. The align (math) is too thin

Additional information: The given text is example text all text infomation has a bunch more characters in align in both itemize and example text should be header of both tikz plots.

I'd appreciate any help, if you need further Information or I did miss anything important just leave a comment.