Trying to run PS2 games at 1080i, is there something I’m doing wrong? (OPL GSM)

So I’ve tried using the latest beta version of OPL (0.93 I think, but it was definitely a beta version) with GSM support. I’ve configured GSM for each game, and while it does output as 1080i, all it really does is upscale the picture rather than increase the internal resolution (basically, it’s still 480p but the pixels are blocky rather than blurry). Also, the image doesn’t fit the entire monitor, and is sometimes stretched or squashed. (OPL displays in proper 1080i though). I tried this...

Trying to run PS2 games at 1080i, is there something I’m doing wrong? (OPL GSM)