Tire Update

Between two F6c's (and two flats) I have now gone through eight sets of tires (counting originals). I rode 48,000 miles in the last 16 months. I keep looking for a radial front tire alternative, writing Michelin to no avail, so have kept with the Dunlop OEM's. The last set, I have gotten 14,000 miles out of the front tire (a new record - usually get 10-12K since I started running more pressure in the front). I ride in the mountains and in a lot of very hot weather (AZ). I have been running 39 psi in the front (checked twice a week) and 40 psi in the rear. I still get the disportionate wear on the left side of the front tire but I have had no performance problems and I run at high speeds for long distances and then a lot of mountain roads. The on-the-road and out-the-door cost for a pair of Dunlops was running about $425 but has gone up to just over $500 for the last two sets. The installer suggested I switch to the Metzler 888 bias tires which would be a lot cheaper. I like the radials in the mountains but do not have any sense of how the bias/Metzler's would compare. (The rear Metzler is slightly larger but that is a minor issue). Any high mileage riders with experience/suggestions?