It's hard to believe, but the spacer change does solve the clearance issue. I've changed some myself and confirmed that there is no vane contact after the change.
The TAC 15
had the same sting stop rods (same diameter) and didn't have vane contact issues because they had the cam spacers installed correctly with more spacers below than above.
The rubber string stops get glued onto the rods so there is not a problem when the string hits the stops above center.
As to your arrow pointing down - this can be changed by adjusting the twists in the buss cables so that the arrow rest can be moved up and still be paper tuned. There's a limit to how high you want the rest though. At some point, you won't be able to site your scope in at close range like 20 yards.
Obviously it's disappointing that fixes need to be made, but I am very confident in the fixes PSE will be doing. The fixes are very small detail type things, not major redesigns. The Elite and Ordnance Crossbows will perform just as well as the TAC 15 has but with fewer warranty issues.