Have you tried doing negatives instead of the 1-leg assisted Chinups you are currently doing.
Or another option would be to use Bands for assistance if available.
I've tried negatives, but they feel so awkward, and I can't seem to setup correctly. I'm already taller than the kids' monkey bars, so I'm not so sure how to lower myself slowly as my feet are already on the ground.
I'm considering bands just haven't gone looking for them yet - making do with what I have for as long as I can.
My only thought on the DLs (other than that I love DLs) is that 3 sets of 10 is getting on to a pretty high volume. Depending on your age and other factors that affect recovery (rest, diet) that might be a bit much. As the weight goes up you may want to consider decreasing the volume a bit. Also, doing DLs every-other workout may provide better recovery.
Since DL's are a new exercise for me, I started out with what appears to be too little weight. I'm shooting for 3 sets of 6 to 8 not necessarily 10. I've been hitting 10s with the weights used, but I'm working up slowly because it's a new exercise for me, and I want to make sure I maintain form. I will definately keep that in mind. Would I put another exercise in its place on days I don't do DL's?