minibarn

Hi
I have a Singer 362 that I treadle and it has a very hard time going through bulky seams. It's as if there is not enough umph behind the needle to push it through. I often will push on the up take thing, or the screw that holds the needle in to "help" it out. Gently of course. Is there anything I can do to fix this? My Janome 712T has no trouble w/the same type of bulky seams so I don't think it should be a problem but maybe I am wrong. I have a 99 that will sometimes hesitate at bulky seams as well. Is it a Singer problem?

Thanks for any tips,
Jp