I know this sounds nuts, but I think master locks and other crappy locks are pretty hard to SPP because they feel like mash mellow inside.
I find medium quality locks to be easier to SPP because the feedback is more consistent and pronounced. Get a Kwikset and a Schlage and pick them in that order. You'll be surprised at how easy it is to read the nice sharp clicks and little "gives" on the core.
I am currently practicing picking the dreaded Ruko 540s in a reasonable amount of time (It's not that hard a lock, it just takes ages
to pick), and I use raking to get to the first level false set to shave 5 minutes off because I start over every time i make a mistake.
Personally I think its fun to rake and zip a cheep lock for giggles, but to me it doesn't compare to the feeling of being bad ass when I KNOW that when this
pin clicks I get an open.. CLICK -> YAY!
I am not there yet with the Rukos... every open is a complete surprise to me still
My point being: Every technique has its place, otherwise it wouldn't have been invented. It's entirely up to you to chose the best technique for the given situation and practice that.