Uncomfortable position...

I think eyebrows is wrong, you have too much weight on your hands and not enough on your arse...short term: risers will help, it will give you a more upright position, therefore more weight on your behind..

56cm is very small for someone your size, get a 58 at least and consider your position as you build the bike.

there's some sort of formula that decised which percentage of your weight should be on your hands compared to your arse, but I think it's very personal...for me 30% on my hands 70% on my arse...that's a guess of course could be even less on my hands...but as I say everyone is different.

in the short run, yeah risers Might help, but in the long run they won't, and for any distance they won't.
also to have any effect they'd have to have a significant rise.

the best solution is to gain core muscle strength.