Have a 2005 Journey 36 and it seems like the toilet paper never seems to go thru to black tank. If I pour water down commode the tissue goes down. The pipe from commode is not a straight shot to the blk tank. Standing in front of commode the pipe goes straight for approx 8-10 " then turns left then I think it drops to the blk tank then. Can the pipe be catching the tissue cause is is scratch up? Don't know if it is but can't figure this out. Any suggestions ?