My two cents.
Drop the flat bench and incline bench.
Instead, do 30 degree bench.
Alternate squats and regular deadlifts every other workout (they both hit the quads to some degree), not a good idea to do them both the same day, dont believe me, check the FAQ, same goes for SLDL, then its your lower back thats the concern, trust me, you dont want lower back issues.
Read all of what follows please, dont stop at my pullup suggestion.
Do pullups, palms facing your head and dips, get rid of curls and skullcrushers.
Buy lifting straps (couple dollars) and use them to assist you in doing pullups, then you cant use the forearm excuse.
And dips, just do them. In regards to pullups and dips, do as many as you can, then do one or two reps or as many as you can the second time, rest, do another rep or two, rest, repeat, until you reach 15 total reps (this is called clustering, do one rep at a time, its called max-stim, both HST approved.
), then add some light weight and repeat.
You will develop more from doing pullups and dips, than curls and skullcrushers. If you wanna really hit the inner tricep, keep your arms tight to your body on dips.
good luck