Many riding Dual sport bikes on the road run too high a pressure, holding onto some preconceived but misguided theory left over from 500 lb. sports bikes. IIRC, your XT weighs "about" 365 lbs. wet. (166 kgs.)
Yamaha are wise to post a variance based on load/rider weight. But tire types can vary some too and of course conditions.
I think you are very close to spot on. I would run:
26 psi rear
22 psi front.
I think you will find you will get the best wear with these pressures for most dual sport 50/50 tires. Many will tell you to run 32 rear, 28 front, or even higher. I have done it and it may ride OK but tires will wear faster. A lower pressure is also much safer in any sort of wet condition and also in aggressive cornering. Trust me on this one.
If you were to load up the bike or add pillion, I'd go to maybe 30 rear, 25 front, more / less.
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