I prefer manual PE, using the hands to stretch. There is no need to leave 30 seconds between stretches, just change hands or the angle of your stretch and carry on. If you are very conditioned and get no results form manual PE, and you don’t want to take a decon break, you could try hanging.
Heat makes the difference between gaining quickly or slowly for some guys, or between gaining slowly instead of not at all for others. And the ideal penis size is 7.6" BPEL x 5.6" Mid Girth.