As others said, SR won't help with tension problems.
Tension problems:
1) Make sure your needle is correct and is installed correctly
2) Make sure you don't have the backing on so tight that you can bounce an elephant on it.
3) Be sure to clean ALL lint out of the bobbin case area and make sure there is NO little itsy bitsy tiny bit of lint under the spring on the bobbin --- amazing how that itsy bitsy bit can screw up tension
4) If all else fails, buy a new bobbin case. I had my longarm in for 2 repair calls and STILL it wouldn't work right. Finally bought a new bobbin case and now it works beautifully!!!