Not that I have any experience with it, but I think the M1 would be a good choice as it doesn't really show much, kfb gives that purl look that you might not want. What about KRL and KLL? What's usually used? Good question, I'm clueless there. Are you doing the increases in the back? or on the sides as for the toe? I agree about paired increases being too much. These socks are going to be awesome!
So I'm sitting here thinking what would I consider doing, and I think I'd do 1 increase on the left and one on the right, maybe one on each needle. Hopefully someone who knows something will check in and offer some real advice.