I paddle a rented Q-16 solo, paddling from the front seat. I'm not sure I understand what you mean by being "squirrely" on flat water?

I've found that if I keep the heaviest pack the closest to the bow, it handles okay considering the "solo" seat is a little too far back for optimum handling.

It's slower than a true solo for sure, but with my faithful double paddle, it's an acceptable for the tradeoff of stability and load capacity and
ease of loading.

I did paddle an older Tranquility one time and it was the only time I've went over solo.
The newer models with the sliding seat and height adjustability might be better stability wise, but I'd rent one and bring all my packs along and see if they'll fit in the canoe without sticking up becoming a wind catcher and even more important raising the center of gravity.

I had to lay my one of my full size packs sideways and the other was flat but sticking way up above the gunnels.
I never felt comfortable because it was so unstable I knew the slightest mis-step I was going over.

If your gear is solo size, then that may not be as issue, but I'd try before I buy for sure.

When I buy a Q-16, I'll move the seat a little more towards the center and relocate the yoke, so I can remove the front seat and get the load even further toward the bow when solo.
I took the "front" seat out this year on in my rental, and I noticed a significant difference in handling being able to slide heaviest pack closer to the bow.

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