Welcome to Basschat! As you say, Warwick have changed a lot in the last few years, especially as far as their necks are concerned. The necks are now standard width and depth, so should you want to revert to thick necks you'd have to check the second hand market (we have the Marketplace here, which is free to use as a buyer).
The neck dive problem is mostly in five-stringers; I have several Corvettes, only one of which is a 4, and that one is almost dive-free. It all stems from having a small body with a neck that extends further than many other manufacturers' models. I suspect that Warwicks are heavy basses because, let's face it, if they had lightweight bodies, their neck dive would become intolerable.
Can you cope with a lot of lefty Warwicks? If yes, here they are!
My four Corvettes:
The Fortress 5, with a couple of non-Warwick mates.