\setkeys{Gin}{width=1.25\textwidth}
\begin{figure}[H] % NO h HERE!
\centering
\rotatebox{90}{
<<<%= paste0("fitc_key") %>, fig=true, strip.white=true, echo=FALSE, height=5, width=8.5>>=
gtoxPlotFitc()
@
}
\end{figure}
