... The subrail is at a 23 degree angle relative to the table surface. I believe I could have lowered the rails with a relief cut as there is plenty of room around the bolt holes. ...
A relief cut won't lower the rails - you would need to mill the whole bottom of the subrail first and then add a
relief cut for the cloth although that's not really necessary on a t rail since you could mill the whole bottom
an additional 1/16. That together with sufficient vertical adjustment in the rail bolt holes would effectively
allow the whole rail assembly to be raised/lowered as needed.
Regardless, the angle is still off which changes the horizontal orientation of the nose even tho set at 1 7/16
In other words, just having the nose height at 1 7/16 does not mean the cushions will play correctly.
In your case you lowered the cushion to achieve proper nose height however the whole cushion orientation
is skewed back 3-4 degrees because of the 23 degree bevel. This would cause improper ball rebound somewhat
similar to a nose height too high and sucking the ball under.
Ken has a good pic showing K55 specs here -
IMO it's more efficient to replace the subrails rather the rework or juryrig them.