Hi Bayley, I guess your'e the guy who emailed me! Small world this internet place!
As the previous poster (and my reply, but I think you had left for the day) - check the pressures via the test ports.
You mentioned a torn gasket around the accumulators, yes - this could cause low pressure on the apply servos. Usage a test gauge to be sure.(I have a gauge hooked up to line pressure permanently)
Edit for the benefit of others searching: the 700r4 tci manual valve body doesn't use a TV assembly. I think the pictures on their instructions are potentially misleading. Photo 4 here:
shows it installed, but step 4 tells you to remove it!