That's awesome, only you can really decide what works best for you. Like I said I tried tank weights myself and had almost exactly the same results as you did, however I hated the fact that I would get turned onto my back so easily. It made me feel really uncomfortable.

Funny though, because I always thought I would hate ankle weights. I thought that they would be uncomfortable and heavy and such. Well I tired a pair and now I am hooked. It is like my feet are always exactly where I want them and I don't notice they are even on unless I look(the weights not my feet).

Isn't it such a great feeling when you get some gear or skill down to just the way you like it! Then you know it is time to move on to the next skill or new gear. And that's what diving is all about!