I was on a high dose of Latuda and developed a severe tremor from it, but didn't really experience the akathsia. Although, I did start picking at my cuticles while on Latuda and even though I am no longer on it I am still struggling with the skin-picking, which is still really bad. Akathisia is absolutely miserable; no one can live like that. Although Cogentin didn't do anything to help my tremor, I think you should try it - maybe it will help your agitation.

I wish I had some great advice for you. All I can think of is to give the Cogentin a try or try a different AP.
https://en.wikipedia.org/wiki/Akathisia