Yea eventually you will find some of your muscles develop much faster than others. Until then you shouldn't be doing any isolation exercises at all every exercise should be a compound exercise for I would say at least 3 months I waited about 3 months before I started adding a bit of isolation and only because my muscles are really forgeted up. My delts and lats are getting bigger waaaaayyy faster than everything else so I've been doing curls and skullcrushers and like 3-4 chest isolations(chest wasn't growing at all from bench alone now it is seeing decent growth when I threw in isolations once or twice a week.)
one lanky guy to another, a protip
don't do skullcrushers. you would understand what i was saying before about the pivot points of our joints and how on a relative basis we lift more; the same thing goes for how much our joints are stressed. skullcrushers stress the elbows something chronic, and at our heights and with our dimensions, it's literally only a matter of time before you give yourself some serious elbow injuries. don't risk it mate.
close grip bench? perfect
tricep pulldowns? great
weighted dips? amazing
but NEVER skullcrushers (i wouldn't even recommend them for short people, although it's less risky)
