are there prospects for stabilizing with dual tails on either wing?

Definitely could. Has attachment points at edges and center. However, just for convenience, I' prefer not to have too. If persists, may need to. Into The Wind also suggested swap edge spars and/or inspect for irregularities.

tail correction can work a bit but it isn't the best for stability, because the amount of drag the tail adds will change with the wind.

the leading edge spar pockets are a little loose to allow removal of the spars, and this can lead to leaning in the kite, because the spars aren't always positioned evenly. I suggest pushing the two leading edge spars all the way up towards the front of the kite before attaching the spreader. The spreader will hold the leading edge spars in place.

Thanks Mathew, I'll give it a try. I had such good results with previous Delta without tails, I'd prefer not to have to use them. However, with the Sutton FF 16, I don't even try to fly without fuzzy tail.

I forget how, but I stumbled into a nice surprise on http://arch.ced.berkeley.edu/hiddenecologies/ when saw a nice image of your Tyvek Delta in the January 13th, 2012 post, A trip to the Mojave Desert.

that was a fun trip!

In high winds I've put a tail on my deltas to prevent overflight, especially when I'm reeling in string. The bridle position could be readjusted but adding a tail is just much easier.

tails can serve many purposes, I would just caution about trying to fix an asymmetrical or unstable delta with asymmetrical tails.