Carpentry and Woodworking - stair building question (geometry)

From over 40 years of carpentry I know a good bit BUT I am not a master stair builder. In theory, I know that the treads should be level from the nose back to the riser. I also know that if they have even a little drop from the nose back to the riser the stairs will be very uncomfortable to climb and descend. I also know that very little drop from the riser to the nose will make the stair very comfortable to climb and descend. My question is HOW MUCH DROP AT THE NOSE IS OK BEFORE IT BECOMES TOO MUCH? I have a job with a finished stairway in which I need to add a layer to the second floor adding about 3/8" at the second floor. I can easily raise and tip the whole stairway which would result in almost 1/8" of drop at the nose of each tread. My geometry is 5/32 = 1 degree I think this would be OK but I would like other opinions of whether nearly one degree of drop at the nose is dangerous. Also, these stairs will not be carpeted but I can add "grit" (that non-skid stuff) to the finish, or (only if absolutely needed) I could add the peel and stick non-skid strips at each nosing (which sort of gives you back 1/16"). HELP!!

Thanks,
Bokonan

Not sure I understand your question. As you should know, staris have the tightest spec in nearly all codes, because even a slight deviation between steps can throw a person off kilter. The steps and risers should be consistent and level. Max riser in IRC is 7 3/4", min tread is 10". IRC does allow 3/8" variation in riser and tread measurements overall.