Did you grow 6 inches in a week or two? Shit, that's impressive. To each their own on ski length though. For op, 170's are on the longer end for you, but they're rockered meaning they ski much shorter due to running length. At 5'10'' my shortest skis are my park skis measuring at 182, and longest are 193ish (pow) and I have no issue skiing them. The 193's are rockered, and they feel shorter than my park skis. You'll be fine and have something to grow into.