TRW PS Pump SL-6 Oddities

ok.......my original 1968 Dodge Dart 270 SL-6 came with a TRW PS pump. Sent to LARSE for rebuild 3x via RMR Restoration and still failed. Finally bit the bullet and installed FEDERAL from Steer and Gear and working perfectly. Anybody know why TRW pumps so finicky? LARSE and Steer and Gear say "stay away from TRW". LARSE willing to refund all monies spent but want TRW pump returned. I have a TRW pump for V8 application (3/8 in low pressure nipple). Is this pump still finicky?

Comments? Recommendations?? Dynamite needed for TRW??

thx guys...ur the best!!!