I use curve OC, though for each card curve is a bit different cos cards have different OC potential, but not by much. Memory is  set to 5003(-502mhz). And then I adjust power consumption using PL, e.g. for Stris OC's 72%, for Gigabyte OC's its 79%. So you gotta tune your cards individually, my settings might not work for you. If you are mining only lyra2z  algorithm you dont need to limit PL at all, just find proper vcore\clock combination that will make ur card's draw below 200wt. It's just I mine on Nicehash, so I had to make curves for 3 algos for my cards: x16r, lyra2z\rev2, and I also got to use PL hence in lyra2z I'll get more powerdraw (though also higher h\r) if I allow 1080ti's to mine at max clock my curve has. With PL they usually stick to 825-831mV and their respective clocks.

ps Here is example of a curve of 1 of my strix's card:



I get a bit higher h\r - 76-77Mh\s with power draw around 195Wt.