How to make full-paged Table's Caption full-paged

Question

My Table can show in full-paged mode.

But my caption still at half-paged mode.

I want my caption be centering in page.

How to solve this issue?

\documentclass[journal]{IEEEtran}
\usepackage{multirow}
\usepackage{makecell}
\usepackage[flushleft]{threeparttable}
\usepackage{float}
\usepackage{afterpage}  % load the afterpage package
\usepackage{graphicx} % for '\resizebox` macro
\usepackage[margin=0.6cm]{geometry}
\usepackage{adjustbox}
\usepackage{caption}% http://ctan.org/pkg/caption
\begin{document}
\captionsetup[table]{justification=centering, singlelinecheck=off}
\floatstyle{plaintop}
\restylefloat{table}
\begin{table}[ht]
    \centering
        \begin{adjustbox}{width=1\textwidth}
            \begin{tabular}{|c|c|c|c|c|c|}
                \hline
                    \multicolumn{2}{|c|}{} & Average & STD & Z & P \
                \hline
            \end{tabular}
        \end{adjustbox}
    \caption{\label{table2} TRADITIONAL EVALUATION SCALE STATISTICAL RESULTS}
\end{table}
\end{document}