I have the Horizon and love it.
Some things to try. Use a larger needle -- or even change the needle as there could be a burr. The FMQ foot should be adjusted so it just barely rests on the top of the quilt (no pressure). There are 2 FMQ feet -- you may want to see if there is a difference when you use the open toe or closed toe. Slow down the speed -- it may be that you need to get used to FMQ with the Horizon at a slower speed and then up the speed when you are more comfortable (I still find myself happier going slow).
Here is a link that has some tips:
http://content.janome.com/index.cfm/...otion_Quilting