Overgassing in hot weather temperatures?

[ta0117]

I’ll try to install a H2 buffer to see what happens. I wasn’t aware that powders can be so temperature sensitive.

I must say I’m surprised that this DDM4 feels overgassed. It’s a V9, so it has 16” barrel with midlength gas system and 0.073” gas port according to DD, and H buffer. This is actually a bit smaller than the standard 0.076” midlength gas port on BCM and the likes, but when firing 5.56 ammo, it’s got a pretty solid kick, not unmanageable but noticeably more than my friend’s rifle firing the same ammo when I shot this weekend. His upper has a BA barrel with 0.078” gas port, and he’s using a carbine buffer. And his gun ejects at consistent 3 o’clock, while mine is 2 o’clock.

I’m pretty baffled, to tell you the truth. On paper my rifle should shoot softer, but it doesn’t, and feels overpassed.

EDIT: Just to clarify, his barrel is also 16" like mine.