to get my hair to the lenght i want i always put the bait on first before i tie my knotless knot, i'll strip about 4-5 inchs of coating. for the lake im fishing i have a fairly long hair of about 3/4 inch.
i dont use shrink tubing all the time as i use a kurv shank hook like the gardner muggas which i dont think needs it for most rigs.
if i do use it then when i put it on i cover most of the knotless knot with it for a little protection, and have maybe 1cm or something coming off the hook.
when steaming it at an angle do it the same angle that the eye of the hook is.
thats how i do it anyway
dan