yo mike.
after seeing your gear, you would benefit more from just staying in strength.
your only at 416 ArmPen.
unless you can get around the ArmPen cap, which hardcap is 1400. you wont see any gains from gemming ArmPen. if anything, your dps might suffer if you regem armpen with your current set up.
your weapons are great for ArmPen, but main items such as your chest, helm, pants, bracer definitely need ArmPen. and then the key item to get is DBW for you to even consider ArmPen.
so try to get to around 800 armpen through gear before gemming armpen.
plus your sigil, i would recommend the i219 one. the sigil of awareness i believe.
the strength increase already suffice from the fallen crusader runeforge.
lmk if you need anymore help.
i'll try my best to provide you better info