I am using Jabra Evolve 65 headphones for my work. However, I find it is quite stressful for my head.
Well assuming the issue is with the headband, I'd suggest using Headband Cover. This covers the headband with soft padding, so it won't hurt even when tight.
Personally not using any, but from quick look, this one appears to be simple to use: (and quite cheap)
The headband of the earphones is like a spring. Most probably there is a metal band molded inside it to hold its shape and keep it fitted snugly against your ears.
When you pull the earpieces apart [A2] from their original shape [A1], they will return to their original position [A3] due to Hook's Law.
Even when you pull the earpieces further apart [B2], they will revert to their original position [B3] so long as the limit of their elasticity has not been exceeded. (That limit is called Young's Modulus.)
You can adjust (reduce) the tension of the headband "spring" PERMANENTLY by pulling apart the earpieces "just" beyond the limit of elasticity as shown in the sequence [C1]…[C2]…[C3].
You can do this adjustment in steps, very gradually increasing the stretch [C2] until the headphones fit comfortably [C3].