It only started working for me yesterday, when i slowed down, i was avg 18s, when i usually avg 19s and 20.xs. and today when i was cubing in class, i got 14, 14, 16, (with first 14 being PLL skip), because i moved slow as heck during F2L. it really Works!! I hope i can calm myself down and practice slow F2L always so i can do decent at caltech.