Following up on this, here's a video of the Steam version showing A-Power getting over 8000 hits in the first part of Stage 5 (up to the last laser turret) - on the PCB the most you can get at the same point is about 5500 (optimally):
https://www.nicovideo.jp/watch/sm30179302
This is all due to the lasers adding far more hits than they should. So yeah, the Steam version definitely cannot be used for score comparisons with the PCB or X360 versions. I will have to investigate whether or not this also occurs in the DFK 1.5 Steam port.
As another follow-up, KAKSTR, who holds the WR with B-Power on the PCB, says the Steam port adds around 300 extra hits per hyper, compared to the PCB/X360 versions. This is true across all modes (bomb, power, strong).
https://twitter.com/kakstr/status/1297874459244679170So if you want to play competitively against the X360 or PCB scores, the Steam version isn't acceptable.