Yes, the WP has a big low end, yes it is not really loose. But. When I think of 90s thrash I think of a more high mids grinding sound. Nailbomb style really. However it still might work out with the warpig in a really bright guitar. In my mind the Warpig might be too big for that sound, while the Crawler is more at home in the range of everything to 80s metal. In the right guitar it could do some thrash, but I think that would be stretching it. The Nailbomb is the obvious choice for 90s thrash, but I do not know how it would pair with the crawler neck. There is a disconnect there I feel.
I really must say I am lost here, so IŽll take my leave. In my educated guess the Crawler bridge is likely too vintage for 90s thresh and the Warpig might work brilliantly, but could also be a bit too big. Nailbomb, possibly, but how does it pair? I do not know.
I hope you get more out of my thoughts than out of my conclusion. ;)