I like to swap Phosphor Bronze washers into my Hinderers. One thing I liked about the MP-1 is it accepts way oversized washers on both sides. Here's a pic on the ones I'm running on my G10 vs the factory ones I took out.
The reason I like the phosphor bronze is it has a more hydraulic feel and with oversized ones you can run the pivot a little looser and the blade still centers perfectly. After a couple days breaking in with these washers this knife flips awesome I was able to firm up the detent and it flips like it's on bearings and centers perfectly. The lock up is also awesome, rock solid even before the lockbar engages you can't wiggle the blade at all.