Nova Pro Wireless earcups not sealed

I've been trying the Nova Pro Wireless for about a week now, and it's been fitting weirdly. The tops of the ear cushions will press into my head, but the bottoms of the ear cushions don't make full contact with my head unless I push them inwards to create a seal. If I don't press them in, I find a lot of sound leaks out and the low-end frequencies are very weak.

I got the WC freeze pads as well but they seem to make the issue slightly worse because they are larger than the stock pads, and I've played around with the different strap and side adjustment settings too. I would say my head is slightly wider than average. I think if the headphones were slightly wider, it would allow the bottoms of the ear cushions to make a full seal instead of having to push it inwards.

Has anyone else run into this issue before?