ExVFT - Welcome to the boards!!
The Isolator is IMO a great Stab! - I own a few myself.
The larger size that you have will completely deaden that VFT, but IMO is a little to much weight on the front end for the VFT, or the Pat. These bows set up a little top heavy and are so recoil / vibration free that your stab may be a bit overkill
I have the small 4-1/2" isolator in the front and a small Sims ring in the rear hole on my ' 03 Pat and it balances great for me.
If you like the feel of the heavy stab on the vft than you have a great set up.