I paddle a tandem solo all the time. My ONLY time taking a dunking was IN a true solo so I've learned the value of stability and ease of loading over sheer speed.
My opinion of course.

Paddle backward from the bow seat. Put your heaviest  pack as far forward as you can. I take OUT the stern seat to do this. Lightens the canoe too. You want to be slightly bow heavy in most conditions except maybe a strong wind at your back. Then you want just the opposite so the stern doesn't weather-vane.

If you have a Double Paddle or can borrow one, take it. That will make it easier to go into the wind and you'll really fly with it at your back.
 
Keep your packs below the gunnels too. Anything that sticks up and catches wind will make it harder for you to control the canoe solo.

Another item that I used last trip and won't go without is a 15 liter dry sack. About a $20 item.
If you find your bow still isn't heavy enough, you fill the dry sack and lay in in the bow. Will make a world of difference. Just dump out and refill if you portage.

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