Your incubator set up looks good, I did the same thing back in my colubrid days.

A few pointers I can share, keep an eye on the aquarium heater, not sure of the quality you are using but the ones I had would crack from over-heating after a while. I then purchased a Ebo-jagger and never had that problem afterwards.

You also might not be able to incubate more then 2 clutches of BP eggs in that setup. Looks good to go after you calibrate it with a rheostat or t-stat. As for temps, aim for 89 and you'll be fine.

Good luck

Marc