+1. What's the old saying...something about having a fool for an instructor.
IMO, your aerobatic training doesn't even need to be done in an RV. Do you have dual controls in your RV? Throttle is a very important flight control for the aerobatic instructor to have when teaching a newbie. A Super Decathlon is not far off from the handling of the RV-8, and as long as you obtain some basic training and comfort with the basic maneuvers, you can do them yourself in the RV as long as you mentally "brief" yourself of the quicker speed build-up in the RV compared to other types. Don't be afraid to pull! RV wings have a lot of induced drag when loaded with G, and you can easily keep the airspeed down by pulling at least 4.5G or so. But you can also do the basic maneuvers at no more than 3G. But if helps to have some training so that you can have the confidence to NOT be tentative. It really takes very little skill and experience to be safe with the basic maneuvers. Now doing the maneuvers with a high level of precision...that's another story.
Which brings up my last point - IMO, anything worth doing is worth doing well. A little initial expert instruction will get you going with good techniques so that the rule of primacy does not leave you with bad habits that are hard to break. And pick up Alan Cassidy's book 'Better Aerobatics'. Don't bother buying any other ones. It is THE best book out there. Applies to all skill levels from beginner level recreational pilots to Unlimited level competition pilots.
You can't do better than Debby Rihn-Harvey, but below are some operators that IAC mantains. They may not all currently be in operation. But it's a start.
http://www.iacusn.org/schools/#state_TX_