I'm not entirely sure how the pricing compares, and I know price can be a sensitive issue, but for the amount of skating it sounds you do, you would be best to invest in a higher end boot. Definitely finding the right fit will help, whether it's Graf or another brand, but I would avoid the lower end Graf boots, as my experience is they have had issues with drastic quality drop off below the top of the line. As it sounds like your foot is a bit deeper than ideal for the PeakSpeed line, you might want to look elsewhere.
The RibCor line has similar plush fit qualities and even though they're represented as CCM's low profile boot a lot of people experience them to be very deep. That might be worth a shot. True TF9s (about the same price as Graf 755s from a quick online search) might not be deep enough, but with their wrap and support, you might be able to fit into them comfortably. Their toe box is very anatomical, which sounds like it could be a start in relieving some of the comfort issues you've had in the past. I'm not 100% sure about the new True TF shells, but the fully custom ones were moldable on the arch as well as the quarters, so if your arch is an issue, you could potentially address that.
The most important point here, I think, is how unique everyone's feet are. Just because I have a historical penchant for Graf and now True skates, doesn't mean they're necessarily right for you, or anyone at random for that matter. Grafs used to be go to skates for refs, but other companies have learned a lot of the tricks that put Graf ahead in the 90's and Graf hasn't done the same quick enough in keeping up with market trends. As much as you use your skates and you probably make some income even on your time spent on the ice, I would definitely prioritize a boot that's the right fit and going to withstand the intense use you're subjecting them to.
One way to get around being so far from many shops could be to get your feet scanned, so you have an idea of how they compare to what fits are offered at retail currently. Then maybe order several skates that best fit that description and return the ones that don't work. It's best to start fresh, with an open mind, as it sounds like you're still hunting for your go to skate make and model. Don't limit yourself by what you think you might need, as you might easily miss a much better solution if you're too keen on something before giving the search a proper go.