Hey Pete,
Thanks for the suggestion about the output cap. I changed it this afternoon from 220u to 100u and I'm getting lovely sustain on every string.
Now, in normal mode I do get that octave morph you described! HOWEVER, I still don't get much in the harmonic mode. I'm getting more than I did yesterday though, so we're moving in the right direction!
Any other suggestions on bringing out those harmonics? What percentage of your entire fretboard give nice harmonic sustain?
BTW, I'm using 11 gauge strings. Do you think I should try 10's or lower?
Also, I designed my driver with a removable core. I cut a new piece of metal and ground it down to about 3.5mm and my sustain still works about the same (although I only got to play with the thin core for a few seconds). I'll try a little more playing tonight and give you a 100% confirmation on your thin core theory. My original core was just under 5mm so there's not a huge difference. But If I find that one works better than the other I'll let you know.
Originally, my driver just used the alinco pole piece slugs from the pickup. It worked but as I bent away from the pole the sustain faded. So I cut a 5mm steel core from a strip of welders steel and just set it on top of the poles and pushed them down into the flatwork of the pickup. Bends worked much better. So, that confirms that theory. Now, as I mentioned, I'm trying the thinner core theory.
I'll keep you posted.
Dezz