Thanks for reporting back! Air is the logical culprit. I'm experiencing a similar thing at the moment despite bleeding the system in Feb. I've plenty of meat on the pads still so think I'll strip, clean, reassemble and bleed all round again. Hopefully that will resolve things.I had them bled again - and we think there was still a small bit of air somewhere.
This helped loads.
And pedal feel (Firmness / amount of travel) also improved enormously once i'd fitted the Ferodo 2500 front and Mintex M1144 rears.
I can understand brakes performing better....less fade etc....with the uprated pads. But IMO pedal travel did too !