Mike...I am so glad you had a positive experience with Dr. Muschaweck. She is a top-notch doctor who is unparalleled in the field of sport's hernias (sportsman's groin, as she likes to call it). And you pretty much echoed my opinion with your comment on how American doctors could learn ALOT from her. You should see how well they take care of you when you go to Germany for surgery. Have you ever known a hospital bed to be a queen sized bed or have a private bathroom with IKEA fixtures and glass? She is the best!
Just to further put your mind as rest - I, too, was told about her posterior inguinal wall defect limitations before hand. She told me the numbers before doing the sonogram; thus, no way for her to back pedal and claim I needed surgery when it didn't meet her own limitations. Mine was huge, and she categorized it as a "major defect" at 3.5 cm long and 2 cm wide, not to mention the 6 cm lipoma she found and excised during the surgery. She said that it had developed for me letting it go so long - almost a year.
If you are trying to rehab it to prevent it from developing further, I can recommend this website - the Hernia Bible: http://www.groin-hernia.com/herniabible/exercises.html
Unfortunately, I found this website too late to make an effective difference to my injury before having her minimal repair surgery. The key is to strengthen the immediately surrounding muscles structures - internal obliques, external obliques and transverse abs - to add stability to the posterior inguinal wall. I have incorporated these exercises and a good dose of hip flexor exercises into my post-op rehab to leave nothing to chance. I hope you can find a way to keep the small bulge she found under control with these rehab exercises. If you find that you do need her expertise someday, please know that you will be in superb hands.