Hi Omar - hard to say exactly what you need without seeing video, but maybe this will help a bit?
Make sure your drop time is still accurate - if you're used to 3 secs in high mode, then make sure you're still dropping at 3 secs in low, etc. Are you using the low mode adapter that Tiffen sells? Without it it's hard to get the sled far enough away from your gimbal handle. Make sure you're holding the post under the gimbal, not above the gimbal or splitting your hand above and below. You can also make the sled longer than it is in high mode to help add some space between the gimbal and the top stage if there's not enough room for your hand. There are times when you can't fit your hand fully under the gimbal and you do what you have to do, but I think it's generally recommended that you learn it the right way.
PS: Might be more appropriate in the newbie section; moderators may move it