I too just bought the VPC MongoosT-50CM2 Base and the push-pull forces are noticeably different and difficult to fly with. I've started a ticket with Virpil....really hope they can come up with a solution.
In the mean time, what's the consensus on the best (least affected) cam at the moment ? Save me some fiddling time...
I'm using the one it came with - Av soft center with 10 cm extension and the different forces are very noticeable