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Usually you won't feel tire imbalance at lower speeds (35 mph). That sounds like flat spotting. My Sky used to do that if it sat for more than a week, but went away after 5 or 10 miles, no big deal.
The 65 mph and up could be wheel imbalance. Did you drive it much after you had the new tires installed? You said you had them put on a few thousand miles before storing it so if they were balanced when you put it away, they pretty much don't unbalance while sitting.
So sitting with low tire pressure for a while likely led to flat spots. Just my guess.
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"Speed, it seems to me, provides the one genuinely modern pleasure." - Aldous Huxley
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