Practical Tuning Question

OK all, 

	I'd like to pick your brains about optimal tuning for coils. When
does one find that the optimal secondary sparks occur? (A) When the system is 
tuned at low power (no secondary discharge)? (B) The system is only 
optimally tuned when the coil is run at a given power level (tuning is a 
function of power level)? (C) none of the above. I can't exactly say what I 
mean by "optimal" sparks because I'm not sure if one gets fatter or longer or 
brighter discharges when the tuning is optimized.

	The point behind all of this is that I've been wondering how much 
the discharge's capacitance changes the tuning of the coil. This probably 
isn't a very simple problem from a theoretical point of view since the 
capacitance chages in time as the discharge progresses outward. But, I 
would just like to have people's observations of their own coil(s).

-Ed Harris(another Ed)