There's actually very little point to try new boots until you've eliminated the issue of backseat. When you're thinking about it, you might realize you're backseat more often than you thought. Its very easy especially if you're going for a loose style.
The key is to keep your balance centered if you want to make your skiing look loose, yet not screw up your shins and toes - shinbang is almost always caused by backseat stuff. In the center of your skis - if you are religious about only being in the center not the back - works great for a mixture of style and toe/shin health.
Best thing to do if you have serious problems though is force yourself to flex forward all the time. you'll be more upright but deal with it for a bit. Eliminate that you don't need new boots by forcing yourself into the front for a month or two. Once you can see that simply being forward is the solution then you can start to play around with loosening it back up.
of course, boots can be the problem too so if you go forwards and it doesn't solve it, then you'll want to just talk to your local bootfitter about a strategy.