Hey y'all, I brewed a Rye IPA last Saturday, first all grain batch for me! Nice! Mashed at 157F, only dropped to 153F. Original gravity, after the boil was on the dot at 1.072, and for some (dumb?) reason I rehydrated the 1 packet of US-05 as per the instructions on their website, instead of my normal previous routines in Extract and just dumping into my primary out of the packet. I also didn't shake the chilled wort in the fermenter previous to pitching the yeast to aerate, although I did shake once the yeast was pitched for roughly five minutes. 5 days into it, decided to take a gravity reading, because the Krausen (which was super active and looked healthy) was dissipating quickly. It was at 1.035, a lot higher than I expected. I've been fermenting in a Kegerator at 63F. Haven't done much else that I can think of out of the ordinary, so I'm assuming I'm just overreacting at the slow drop? Is that even slow? Does it seem normal for ~5 days into it?
I'll try to relax in the meantime, and thanks in advance!
Edit: I'm using a refractometer to measure FG, can that be the cause?