Hey, we all have catches, part of the sport, but if you are digging in or catching a whole lot, just realizing that you are doing something, wrong, instead of blaming the tools or such is a huge first step to solving your problem.
I just spent the last two days with Eli Avisera and Jean François Escoulen, world class turners, and I now realize that I was doing most everything wrong :roll:
You can learn a lot by watching DVDs, or reading books, standing next to someone who really knows how to turn, well that cannot compare, IMHO.
Find yourself a local turning club, or a mentor, take some classes, but get some time in on the lathe with someone who can show you what you need to know. Practicing the wrong thing a lot will just mean you have to spend time, down the road, unlearning bad habits.
You can learn a fair bit from your catches, with the lathe off, you can so a crime scene investigation of the dig in, or catch, slowly turn the bowl with your hand, (Lathe turned off!, or better yet, unplugged), and see how the tool dug in.
Body position, stance, tool presentation, sharpness of the tool, gouge size style and grind, as well as your mental preparation count for a lot.
With the right training and practice, you WILL improve.
I know, not much help, but I hope you can gleen a bit of something from this post.