I'm new to this forum, and a reasonably advanced intermediate skier (mostly groomed blues, occasional blacks, not good on moguls or deep powder).
I've recently got back into skiing after quite a few years of only going once in awhile. I recently upgraded my boots with a local shop/bootfitter (old boots were Solomon exps 8.0 from 15 years ago; narrowed it down to Tecnica Cochise 120s and Tecnica Mach1 110s, and chose the Mach1's - a little flexy for my 5'11" 190lb build, but was far more comfortable than the Cochise), and tried them out with my (also 15-year-old) Fischer Maverick 195 skinny slalom skis.
Something I found - and that I remembered from skiing years ago - is that often when I'm just skiing straight down, and also on some turns, one or both skis will pivot directly under my foot, kind of fishtailing from side to side. I'm trying to keep my balance steady and weight centered, but this still happens.
I'm going to be upgrading to some modern skis soon (looking at Volkl Kendos to be able to add some backside and powder to my repertoire), and want to "debug" this fishtailing behavior before I upgrade.
So 2 questions - 1) does the above gear choice seem appropriate for my size and level? and 2) what are typical causes for skis doing this fishtailing and simply going straight downhill?
I'm new here, so I hope this is the right forum to ask this question in. :-)