That sounds odd, as R2 is not a 3-cycle method but a 2-cycle method.
Misunderstood. Recently I try to learn 3-cycles (Noah's tutorials), but they are really hard; constructing the suitable commutator requires way too much thinking for me. Therefore I doubt they worth all the trouble. I just say if you think 15s is not bad for R2, maybe I should stay with my method (Boomerang), since it is also near 15s for me. Should focus on memorization instead of learning a new method.