I have an Innova, don't have a Towa gauge, and rarely have tension problems. However when I first got the machine there was a learning curve. Some of the things to check, in addition to your tension settings -
Do you need to replace the check spring on the tension disk? They wear out and are easily replaced. It makes a huge difference.
Is there any lint stuck in your bobbin case?
Are your bobbins wound evenly? (If your tension changes as you quilt, this could be the problem.)
Is your quilt loaded too tightly?
And it sounds obvious, but is your machine threaded correctly? Some require more than one loop around the tension disk to get good tension. And if you're missing any of the thread guides it could cause a problem.