I have learned over the years that there are so many ways to achieve your goals. The key is (as I sound like a cliche machine) is “to find what works for you.” How do you do that - try things.
As far as doing your rack lock-outs, I would recommend you also only attempt those merely several times a year. The advantage with those is that you can load your CNS to 110-120% of your 1RM! I believe these are more for strength than size, even more so than the partials. However, if you extended your TUT (time under tension) with these, you could get a hell of a mass-stimulus as well.
But, remember - design your work-outs on your goals. If it’s maximum strength, most sets should not be more than 10-15 seconds long. If it’s mass, you want longer TUT, upwards of 20-30 seconds. If it’s both, do a combination - heavy and brief early in the workout/week, moving to lighter and longer.
An addition to this topic is the rest pause theory. Where you use a combination of decently heavy weight and racked rest periods between each rep to achieve both strength and size gains. Typically, strength rest pauses are 30 seconds to a minute pause. Size pauses can be anywhere from 5 to 15 seconds… or so.