Do you have your machine set level with the table? That would make a big difference. If that isn't possible, then a plexiglass surround or similar, that is at least 18in x 24in would help.
Then a silicone coated slider underneath the needle to help smooth the quilt under the needle when you are sewing also makes a difference. There are a couple on the market, but a cheaper version would be the kind made to go in your oven for baking. - I have one that I used sticky tape on the bed of my machine to keep it in place. (if you buy the oven version, just cut out a small hole that is large enough for the feed dogs to stop them chewing it up.