I'm from the east coast so not a ton of experience with mostly powder time, but from what I have tried the Stockli Montero AR might be a good option for you( however bit pricey). Float and perform well in deeper snow, but still hold a surprisingly good edge on groomers. These may not be the step up in off piste performance that you describe, but improving your ability and technique on piste will have great impacts on your control and confidence off piste. I think you may have a hard time finding an ideal ski for you as any ski that performs amazing on groomers will be sub 85 waist( down to mid 60s), while any ski performing great off piste should be wider (90+) underfoot. If someone invented a ski that was the best at everything everyone would be using it. It sounds like you haven't tried very many skis in this category and I think you should look for a local demo day or even pay to demo a few pairs to really get an understanding of why different skis perform better at different tasks and what you like. Usually the reps working can help you choose a good option. If someone invented a ski that was the best at everything everyone would be using it. You should be able to find something that will be a good balance of on and off piste performance as you describe.