Warload, I did the exact same thing when Spring came out, however, with that version of Spring there was a lot of crashy crashy, so I decided I've get it another go now.
Yeah, I tried messing around with the armor.txt using Flozi's app, however it did some confusing things and made me cry. Seemed like it might have loaded a bad file.. Or somethingm I'll work at it a little more. Is it really that hard for the SY's to add old support for individual damages? Seems like one of those features that harshes a lot of mods being converted.
I've also noticed that all tank destroyers that don't have a turret have a problem with firing their weapon. Furthermore if you try and pilot them and attempt to force fire, the weapon will always be stuck on "Aiming."