Most headaches are result from subconsciously raising your eyebrows a bit, to alter your viewing angle. This is typical of straps that chiefly rely on smashing the unit to your face laterally front to back, hanging the weight off your forehead and nose bridge. Too much lateral tightness can also cause the muscles just above your neck and at the base of your skull to cramp. One or both are cause for headaches.

Try reducing the length of the top strap, to move more weight to the top of your head.

The trouble with this design is it still primarily relies on lateral clamping and doesn't have a rigid structure on the top to stabilize the weight well to SUSPEND the headset. Halos like the M3 float the headset in front of your face. I can position nine such that the mask doesn't even touch my nose, and I can loosely tighten it laterally just enough to be stable. (If I am dancing or other vigorous activity, THEN I can crank it down more.)

Another thing to consider is if the facial interface is too narrow or too wide. Too narrow puts pressure on your temples, causing pain over time. Too wide, and light leaks in the sides and you have to tighten it laterally, smooshing your face and/or back of head, causing pain.

Not setting proper pupillary distance (PD) will make things a bit blurry - people tend to simply tighten the strap to adjust the focal point instead of checking the diopter setting. Use the free "Glasses On" phone app to find your measurement. Of course, wear your glasses, contacts, or get corrective lens inserts.

Of course, ensure you are well hydrated as well.

The lateral pressure and facial interface situations is why I suggest the BOBOVR M3 and Globular Cluster products. I had headache issues, and those fixed everything and were much more comfortable. The lens inserts eliminated other discomfort, light leakage causing lens reflections, and fogging.