The reason most owners, including myself, switch from the 70 to 80 series tires is for a better ride. Putting 80s on the front is where you will improve the ride comfort the most.
Since your front tires are new 70 series, I would buy 2 more 70 series and put them on one side in the rear and bring your already installed new 70 series from the front and put them on the other side in the rear. Then also buy a 2 new 275/80R22.5 tires for the front. This way you only need to buy 4 tires.
I went with Michelin XZA3 LRH 275/80R22.5 all around on my 2004 DSDP.
Tom
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Tom, Pat and Buster (the Boston terrier)
2004 DSDP 3807, 370HP Spartan
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