Yea you really need to be careful especially with such a low Oxy tolerance.
I would suggest that you stick to the oxy, but if you are going to use H just be very very careful and start very low. Since you suggested smoking you can always do it little by little until you feel the way you want.
Also there is a huge misconception (especially around here and BL) that black tar is ALL crap and weak. This may be true in some cases, but it is NOT a rule.
I have come across some BTH in the past that .05 floored me and I would usually bang 3 or 4 30’s.
Just start very low and work your way up. You can always re-dose but you can never un-dose!!!!
Good Luck