Issiues with new laser

Hello!
I've just replaced laser in my slim PS2 (SCPH-75004 laser is PVR-802w) and it has problems with reading burned discs. Last laser didn't have this issiues until it died.It sometimes reads games as DVD Video (aren't patched with ESR). Other times after showing PS2 logo returns to browse menu. So is there anything I can do to resolve thoes problems. I was thinking about tweaking resistors on the new laser to match values from old one. Will it help? Right now I can't afford another new unit.