#first 22

so i was out on my beneteau first 22 rn and i realized ive been messing up my sail trim bad. specifically with the genoa, i was over trimming and killing my upwind performance. been reading some sailing forums and apparently thats a rookie mistake. anyone else have experience with this? what are some tips for optimizing sail trim on a first 22? imo its pretty frustrating when you know youre not getting the most out of your boat