Currently following a basic HIT style training system with
M-Legs
T-Chest- BI
W-off
Th-Delt Tri
F-Back
Day off and then repeat only shifted to Sunday

Currently having problems with my tricep growth while the rest of my body is responding very well.
Any help would be great.

Tri routine: Skull crushers, Cable extensions, overhead extensions (dumbell)
1st set 10-12, 2nd 10-12, 3rd 6-8