Will be a bit harder to figure out the recipe rank once physical levels are gone!

SE should just show the recipe rank. They already show mob rank . . .

Edit:
Its worth noting that the SP gain is ON AVERAGE half the XP gain. So if you are doing a recipe thats the same rank as you, you'll on average get 250sp a synth. That being said, there seems to be a +/-50SP variability that is completely random.