I'm also a grower and have difficulties with spooning. Taping worked really well but is very uncomfortable when morning wood strikes. I use a foam cock ring cut from a yoga mat. I can't feel it when it's on and it's elastic so it'll expand when morning wood attacks.
Can you please post some pictures of the yoga mat ring? I'd like to see it, and learn more about the material it's made out of. Also, if you like the tape method, but find it uncomfortable with morning wood, you may wish to try the liquid latex method I discussed here.
http://pulledback.org/index.php?topic=208.msg1611#msg1611. It provides similar results to the tape method, with greater comfort, in my opinion. One thing that's great about the latex method is that it allows for more flexibility in terms of the proportion of pull-back on the dorsal side vs the ventral side. With the tape method, you're pretty much stuck with a 1:1 ratio, which is fine if you have no frenulum. But if you have one, especially if it's on the short side, you may wish to arrange for more pull on the dorsal side than on the ventral. Otherwise, you may find yourself with the frenulum pulling down too strongly on the head during erection, or too much bunching of foreskin behind the glans during the flaccid state. The liquid latex method lets you adjust the proportion of pull with complete specificity all the way around. Definitely worth a try.