Some further info...
I know the disconnect needs to go but, I tried the trigger with an original 13 round mag and its smooth as butter again!
When I finished cleaning the gun before, I also used a new MecGar 15 rounder when I reassembled it.
Seeing as how the MecGar has a mirror finish as opposed to the flat finish on the original, it surprised me.
There must be a fractional difference between them because its a major difference in trigger function.
Without the disconnect it will be a non-issue.