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Ya know what, ...my money is on the welded diff for sure. Typical charateristics is understeer into corners and oversteer coming out. Do yourself a favour and swap the welded centre out for an open spinner or even better a LSD unit.

If you think that you are going to keep the welded diff & still drive it on the street then modify your driving technique to speedway style & throw that sucker into the corner & steer it with the throttle.

Keep a good supply of spare axles on hand too.
Oh yeah, what brand of tyres do you use? I want to buy shares in the company.