Purely speaking from personal experience with swapping from forged to cast plates and I can say it was not worth the effort. On my last 2 boards I tried:
1) 5.2 / 5.6 V-Hollow w/ Cast Baseplate
2) 5.2 / 5.6 V-Hollow w/ Forged Baseplate
Did this to try to get the perfect wheelbase combination. #1 always felt more natural, I think it's the combination of height, weight and how much the wheelbase shift with each baseplate that performs best as is. I thought the additional weight or height would help but it never felt quite as right as the stock combination and would swap back to mid-session. Worth experimenting if you have a set with cast baseplates lying around, but performance improvements (if any) were negligible. Didn't find the slide better or worse.
I struggle to find the perfect setup for Ventures (deck steepness / length / wheelbase, truck baseplates) that I find myself sticking to Thunder more often these days. Sliding on wheels doesn't impact me as much, pinch loses to Ventures slightly, but make up for it by being incredibly nimble and turn-y.