What stats do you have and what armour do you use?
For every stat/armour theres a different amount of absorptions used.
You have to find it yourself, for me now it is 9 overloads, 17 absorptions but thats because im using Void(ranged).
When i use dharok i can take less absorptions and more overloads, so i can stay longer in-game (dharoks takes less hits, so less absorptions needed)
I think it is best for you to find out yourself, do a test run with about 10 overloads and the rest absorptions, if you're absorptions run out but you still have about 4 overloads left, then withdraw 3 overloads and take 3 more absorptions next time.