I have a Exmark Metro 48" mower. I just picked up a new Mower Brand dual wheel swivel caster sulky. I love the dual swivel wheels - the mower turns on a dime, however when I am mowing an a very slight incline I find myself having to break on the uphill side to try to maintain a straight line. The sulky follows the mower perfectly straight. Do you think that since I am on a slight incline the swivel wheels are causing the machine to pull to one side? Do you think the front Walk-Behind Weight Set would help to keep me tracking straight? Has anyone experienced this problem? Thanks!