Looks good, except I would set T2 to 81°F (from 80°F), the High Temperature Alarm to 82°F (from 80°F) and the Low Temperature Alarm to 75°F (from 74°F). This way the Cobalt heater shuts itself off when it hits 80°F (instead of the Inkbird) and you don't get a wailing alarm from the Inkbird if your temperature ever hits 80°F (it has to hit 82°F or drop to 75°F).
The Inkbird will always stay on if the temperature is above 76°F, and only turn off it the temperature hits 81°F. You'll get an audible alarm from the Inkbird if the Cobalt heater fails and the temperature drops below 75°F or exceeds 82°F. This gives you a ±1°F margin of error for the alarms on top of the ±1°F margin of error for the Inkbird temperature probes.