First off, ditch the separate feeding tub.
Feeding tubs are old school and proven counter productive over time.
I have been feeding my snakes in their enclosures since I started out in this hobby almost 20 years ago....
I have never once been struck at by any of my snakes inside their enclosures.
Feeding tubs will:
A) increase the chance of the animal refusing food. Moving the animal = stress. Stress = refusal.
B) increase the chance of the snake regurgitating it's meal IF it eats. Moving the animal = stress. Stress = regurge.
C) INCREASE your chances of being bitten. IF the animal eats it will often remain in feed mode for as long as 24 hours or longer. So when you move the snake after it eats, guess who's hand gives off a similar heat signature as a mouse or rat...yup. yours...
There is literally ZERO benefit to a separate feeding tub. Feed inside the enclosure. The animal is much more likely to eat where it feels comfortable.
These are ambush predators who thrive on staying put and eating. They don't like to be exposed and handled before, while or after eating.
Oh, and you haven't answered whether or not your heat sources are REGULATED BY A THERMOSTAT???