There are lots of threads about this issue, and ( JMO ) most of the issues are set up related. And then there were a few I read about that they could not get rid of it. I suspect hull defects or warpage to be responsible for these, as there was mold warping issues. http://hydrostream.org/Specific%20Models/Vector.htm
Read the complete article, and it will describe in detail the hull and mold issues.
The Varmint has basically a Vector hull http://hydrostream.org/Specific%20Models/Varmint.htm
In my research, I found that with the Vectors and V-Kings ( I have one of both, but neither one wet yet ) "Allot" of guys mount the motors as close to the transom as possible, moving the center of gravity forward.
Those trim tabs may do just exactly what you want though....I read some good threads about those as well. I actually had a set of fixed tabs on one of my Checkmates from years ago, but were there just for the hole shot, and ran high and dry when up on the semi pad they had.
My guess is "if" that boat had the porpoise issue, and I believe it did. ( I saw his youtube video's...I actually considered buying the boat, didn't because I really wanted a V-King....but ended up with a V-King and Vector
) You have likely resolved that issue with those tabs. AND you have centered up the weight distribution.
You have done a wonderful job with the modifications you have done.
I can add only one thing....Please be sure you have, or you do it yourself....be SURE the core and transom are rock solid. If you research HydroStream hull failures, you will see why Hippe and others...and now me suggest you do this.
I hope your hull integrity is perfect!!
P.S. I sent you a PM about the steering you removed. It should fit my Vector quit well. If you care to part with it?