I came very close to finding my lead tone then I changed the choke and OT to magnetic components, now I back to square one in tweaking the tonestack, but the clean channel is much richer now IMHO.
It's frustrating when you get a sound one day then the next day you turn the amp on and you think that lead channel sounds like crap again and yes I only use the lead with the PAB engaged.
Most of the time I just leave it alone because I am too lazy to pull the chassis out of the cabinet again and chase tone and end up using the HRM for cleans & Stray Cat for my lead sound.
Sometimes you can spend too much time tweaking and not enough playing.