Hi, you can get about 4K per bobbin with 42 maybe a little more, watch your tension, not too much and not too little, 43 can get upwards of about mid 6K to 7K per bobbin, 44 you can get as much as 9 to 10K, wind pattern is also important in the sound it will give as is the coil shape, different wire can affect the tone as well, formvar, solderon, enamal etc.. As far as unbalanced coils, you get even more tonal variations, but remember, both coils need to be pretty close to the same resistance for them to work to cancel out noise from each other, hence humbucker. uneven sounds great but you do get some noise. Hope this helps out.
benbo