Just popped that other chip in - it works - sort of. Seemed like the effect was more subtle, but I had been twiddling trim pots. Tried it again with the chip from Small Bear, and the flange was super deep again immediatly. Seems like if you popped it into an old delay pedal to quickly check it, it would appear to be working. Of course, it could have been something I did - I've put chips in and out of the sockets enough damn times, I'm not sure I've been using the same one, since I put pulled chips back into the foam to keep from losing them. (I stepped on an upside down 4558 barefoot once - no fun at all.)
Anyway -
Measuring at pin 10 and 11 worked perfectly with my meter - numbers jumped around a tiny bit, but just in the last couple of decimal places. Those trim pots (T4 and T5) are *very* interactive, and super touchy, but eventually got the numbers where I needed them.
Still having trouble setting T3 with the meter - when it gets to the top of it's swing, the numbers seem to get "stuck" sometimes. They also appear to be much higher than the numbers when I'm using the Manual control, but setting the enhance into the point where I get "slide whistle" sounds, it seems like the range is the same whether using the LFO or the manual control. Ended up just setting T3 by ear where the effect seemed the most intense.
Any advice on setting the clock null trim? (T6)