Scott Pilgrim Tones and BGs

You have any advice for incorporating halftones/screentones into comics digitally? I've been making due (through photoshop, not manga studio or CPS... that's probably the FIRST bit of advice you'd give I imagine) but I'm having trouble making any tones that don't look out of place or that don't turn into pure gray when compressed (if it's going to do that, I'll just use gray instead of a halftone, you know?)