Well yeah, the thing with AW is that while the backgrounds are all sharp and 480p the character sprites aren't for some reason, as if they were transferred from the old 240p rez to match the larger 480p backgrounds. This also happen in KOFXI, NBGC, and Neowave. Funny enough this problem is not present on the PS2 ports and under progressive scan the games looks phenomenal, way better than the carts, lol. Scanline generator on AW?! Dude, the sprites are fudged, no scanlines are gonna fix that. Sorry man. ...but there are some good news! Guilty GearX 1.5 and FotNS/Hokutonoken, looks legit on both 15k and 31k. Same thing for Isuka and the Rumble Fish games even though RF runs on a very sharp 480i when on 15k, almost looks like 24k.
I used to have a cyberlead and although it wasn't try-synch, you could run VGA to it but at a lower rez, it wasn't 31k but it wasn't 15k either, think looked awesome with AW, I kinda miss the cab now...lol.
Come to think of it, it seems only SNKP games have this problem 'cause Dolphin Blue looks great too...rather curious now, maybe someone else can shed some light unto this.
Also, back to the scanline thing. While the scanlines would be trying to accommodate the 240p upscaled sprites...the 480p backgrounds will look odd on a scanline generator. I dunno, guess I have to see it in action but most scanline generators are off even under the best of cirmunstances on LCDs, I dunno how well would they work on VGA CRT. The math doesn;t add up though, just my POV on it thought, I'm down to be questioned or proven wrong.