how to get more damage on Flame Golem build

so I am running a 5x golem build having a problem regarding the gems for golems
currently using (lvl4)empower + Lesser multiple proj + Fire Pen + Minion Damage + Spell Echo
+ Flame Golem(level 21) all other gem lvl 20 with 20 quality
4 Flame golem 1 Ice golem
1 might 1 anima 1 eminence 6 harmony

should i switch out any gems for more damage?
i feel like my damage is a bit lacking dont know why, maybe i am using the wrong gems or jewels


so anyone have idea?

Skin of the loyal corrupted to get a + 2 lvl all gems.

double clayshaper
replace empower or fire pen with controlled destruction
ele weakness + flammability curse
EE ofcourse
resist pen is rly strong here

Basically everything primordialiege said. Looks like your next major upgrade is a 6L. Also, Convocation can help occasionally to get your golems back into cannon mode.

Is there a particular situation you feel the damage is lacking or just in general?