I officially prefer the Thunders for my local park, it's really small and sometimes with the Indys the surfy turns aren't quick enough to adjust myself.
The short base plate hasn't bothered me on tail/nose slides yet, it probably helps my wheel are 103a and that there is steel edging on the high and low ledges.
I think tippy was the wrong word, I feel very stable on this setup, I meant a little twitchy and wanted a stronger rebound but I have managed to find a fix for that too, I modified the Bones Medium bottom bushings I had in my draw, and switched out the top bushing. No more twitchyness and much better rebound.
Its maybe not the best bushing setup if your concerned about how your bushings look, and if you don't have a grinder or similar it might take a while to modify a Bone bushing to fit your Thunders properly. I can't speak of longevity yet I've only had 2 short sessions with them, its too dam hot and there is zero shade on the park.
I'm getting a bit of wheel rub but no bite yet
Seems like I had nothing to fear from the Thunders.