I don't think that May/June in Siberia is any drier than July/August, in fact IIRC late July/early August are considered the best time to do the RoB (that is, the OSR, on the new road I don't think it matters). In any event, drier is not always better, because of the resulting dust if there is any truck traffic.
I rode to Yakutsk up the Lena highway in late June, and then to Magadan in mid-August, both times the weather and road conditions were generally quite good. I was on an xChallenge but certainly could have done these sections on a GS1200, probably on a Goldwing.
If you have not done so already, you should certainly look at xDream's BAM ride report on ADVRider, he rode the Western BAM solo on a F650 Dakar without incident (although perhaps a "kids don't try this at home" warning would be appropriate). Then of course there are Colebatch's and TonyP's ride reports).
Personally, I think the bike you take is less important that if you decide to try some of these sections solo; it might be a good idea to not do some of these parts at all if solo, and if you are not solo, the choice of bike might be less important. A final consideration is your fuel range on the DRZ?
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