You should be able to try different variations on your 54cm bike of hand and butt positions. You might find that you like the taller frame, or that it isn't quite right and smaller is better. I have found that playing around with frame sizes is a positive experience. I found my favorite bicycle by getting it used for nothing and rebuilding it to suit me. After several changes over the years I've gotten as close to perfect in my fit on this bicycle and have been able to replicate that position on my other bikes. Good luck with this effort.