727 shift kit?

if pat Blais did the trans, he probably raised the line pressure, at least. He was never a big proponent of shift kits, but maybe he's changed. I haven't seen him in years.
Now, I don't KNOW if this is possible, but they make these thin wall shim sleeves to restore seal areas for dampeners, and axles, and such. Maybe they make one for your situation, it's worth checking into.