First launch in new big block cuda - video
Nice work, OP. She's a ripper!
If you REALLY want to dial this car in, borrow or invest in a set of corner scales. That'll allow you to see the weight distribution for all 4 corners, and then you can add/remove weight where it's needed until you find the right combination for your car.
And then if you add Caltracs and monoleaf springs in the future, you can set the preloads on the scales as well. Not the cheapest method, but it is scientific. You can do it all in stages after you source the scales.