ficone, thanks for having me double check that lpk. I shined my work light down in the fitting, and discovered that even though its a 1/4" opening, the hole that was bored through the pipe was only 1/8".
I opened the pipe up the whole way to the 1/4" size Im assuming it should be.
I also replaced every seal in the marker with the seal kit I purchased.
Hopefully, that should resove the issue. I will be updating the thread tomorrow, after I test the marker again.