Yeah, I set my bikes up the same way. Just a slight bend in the knee, when heel is on down pedal (I see 5:30 position as an approximate match for the seattube slope). Then, take a high cadence run and if hips rock, adjust down a smidgen. Comfortable pedaling for hours. Any lower just does not feel right.

Yes, do measure and record the center of BB to intersection of saddle surface, along the seat tube. Also, record the distance from the seat intersection point, to the your top of your bars. Seat setback counts too, but that is easy to get a feel for. Makes it easy to check out new rigs without worrying about the size number pasted on the tube or stamped on the BB.