I made another adjustment i was having problems with heavier thread breaking or skipping stitches, one thing i found was the needle scarf was about 1mm or maybe 2 away from the shuttle hook. I loosened up the arm and was able to get it adjusted to within maybe a .5 mm which helped considerably, it doesnt break the thread now but i still need heavier needles which are a few days out.
I also filed on the foot teeth some more cleaning them up with a file to the point now they don't tear the hide, almost unnoticeable before finishing lol.
A test piece i did this morning, with the tex90 and Schmetz 18 needle. it is 2 pieces total 1/4" thick each pass is about 5" long so about 30" of continuous stitching without a hiccup. I feel i could easily run this machine till the bobbin ran dry.
After looking at the Schmetz needle it is chisel shaped giving an angled slot, the shaft opens up the slot nicely to get the thread through and final finishing closes them up just like hand sewing.