I have put my share of Transgo kits in 904s and 727s without any real problems. But when I tried to install the Transgo kit in my 518, I had nothing but problems. None of them were the same as yours, but several that I was not able to resolve. I finally had A&A build me a valve body and all is good. If you can get an unmolested valve body somewhere, I would start with trying that and see what you have.  I had nothing but problems with the TransGo kit in my 48RE. Ended up taking most all of it back out.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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