I'm sure I'll get a lot of flak from many here, but your seat looks too far back. Too much rise on stem. Stem to short.
The more aero my position, the less weight I actually have on my shoulders because my waist can only bend so far. A forward saddle position balances me on the BB better when putting out power.
Stiff arms for the entire ride will make sore shoulders and numb hands. Do you ever use the drops?