Tom,
I think you are on the right track. I am a newbie too as of a couple years ago and I know the struggles of being 200+lb guy and learning at the slower speeds. The fact is the skis were never designed for our body type. My normal skiing weight the past few seasons has been around 215-220 and I work my ass off in cross-fitness and eating properly to maintain that.
My amateur advice is the skiing will come with training and coaching but to excel at this game you got to be in the best shape you can too. Dropping weight will make a huge difference and get into a regular exercise program that is full body training (balance, body weight exercises, cardio, etc). I set some pretty tough goals this year and that is to get to under 200lbs and I am doing this by managing my calories using an app called myfitnesspal and exercising in some way 6 days a week. My goal in the course is to make a 34mph at 32 off pass. Game on!
Eric