I take it you guys live in California. That's the only state I know where there are so many Doubles, Triples and the 508. There are several friends of mine who ride that series, one of them is a woman who is always stoking with different captains. She also does the doubles solo and has a combined record of 50.
I only mention this as an alternative for those rides where your husband wants to tandem and you'd prefer to solo.
If you think this would be a viable alternative send me a PM with a phone number and I will contact my friend to see if she would be interested. If so, I'll give her your number and she would contact you.
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ljbike