And, in the end, as the balance is always related to some point on the wing chord, and as the position and size of the tailplane only shifts things a small percentage, the balance won't actually change much. Use the same as before and it will fly much the same. Only thing is, you do what is needed to get it back where is was, add balance weights or remove/shift moveable weight (batteries?)as needed.
Evan, WB#12.