MP is right about the width issue.
I'm a dedicated Double Paddler so I just use CANOE double paddle which for a tandem is a 9 ft one.

I still use the single paddle for slow trolling/backup paddle and have one that is long enough I can still paddle in the center of Bow seat solo.

You just have to make "adjustment" to accommodate your new ride.

The Wind IS a big issue solo and even more so in tandem being paddled solo.

I see pics of tandem paddlers with the packs standing up, which is fine maybe for 2 people, but you do that in a solo, your talking "sail" and whatever wind direction except maybe a tailwind, you're going to have even MORE control issues.

Even with the "learning' curve involved using a tandem to solo, for me, the tradeoff is stability is worth it.

On MORE than a few occasions, I've STOOD in my "solo", knee's braced against the yoke for balance, in shallow/muddy water that would have been hard to wade, and like a Gondolier used my double paddle to POLE my way thru.

I don't think you could do something like that in too many true solos :-/

Another thing about a tandem vs true solo, you can ( in my experience) get thru shallower water because of the increased hull size/buoyancy.