Yikes, you are really busting out of that lower mid section. I can't believe a fitter recommended you try a thicker felt tongue, ffs. One look at that and I agree customs would be your best bet, just make sure that whomever you go to knows their stuff because you need a custom facing and a narrower boot so the measurements need to be spot on. I'd recommend you take manual measurements and then compare them with the scan and measurement data before it gets sent off to True. If you aren't happy with what they have produced, make them start again and don't let them send it until YOU think it is right.