My shock is at least 5-7 boards stronger than my Tag. My Tribal Fire at 4k is in between them both and much smoother.

My Forza is about the same strength as my Shock, but different motions. The Forza is smoother on house, which can yield some carry issues from the angles I play. I find that Motiv's high end balls work great on flatter patterns while the midrange and lower are ths killers. I just got my hands on a Redline and oh boy! This ball will make a lot of Sting owners happy.

I think on ths the Vengeance is a great compliment to the tag.  Too much separation in sport/flat shots but not THS

Yes.

I think I'd suggest the Revolt Vengeance or the original Primal Rage if you can get one. It's not as strong as the Jackal or Remix but still stronger to have more separation between it and the Tag.

I'd still consider the Venom Shock also I'm just not sure if it'd give you exactly what you want to play deep

The forza and shock for me are similar on a ths except the forza is a tad stronger. But when I throw them on a sport shot the difference is greatly increased. The forza plays many lines on heavier pattern while the shock does not become versatile til medium - light oil patterns.
The venom panic tho I think would be a good step up for the tag. It won't be a big change on a house shot but on a sport shot the panic does its job being a few boards stronger than the tag. Pretty similar shape wise.

Shock if u want smooth a bit stronger than tag. Forza stronger smooth and better for medium to high oil. Panic I think would be best step up from tag in general.

I ordered the panic today. My house rarely lays down anything heavier than medium so I figured that the panic and tag would be a good 1-2 punch.