I have that same frame, is the plastic tracks in good shape? Mine get small nicks and dont run smooth like that.
I just replaced mlne ordered from grace for 18.00 dollars each. I had the wood carage and l did buy new carrage from allbrands.com
That new carriage did help the wobble. I dont know if the one at grace is the same one or not but the one i got was cheaper.
Please excuse my spelling.l have phaff machine on mine.