The function of channel strip EQ is to shape the sound so the whole mix sounds good. If the signal coming to the FOH is too bassy to sit in the mix, cut the lows. I send the FOH a signal that's pre EQ because I know my cabinets don't sound anything like a PA cabinet. Why would I presume that the EQ I need on stage while standing three feet in front of an Eden D410XLT is the same EQ that'd be needed to make my bass sound right 60 feet back from a stack of EV 18's, 15's and horns?
Now one thing with Mackies however, is that the first gain stage has some built-in EQ that's tailored for making vocals with an SM-58 sound good. Bypass that stage by using an XLR to 1/4" adaptor (don't need a transformer) so you're plugging into the 1/4" channel input (not the TRS patch point, but the line in). That's in Mackie's owners' manuals and it's a flatter signal. Start with as flat a signal as you can and EQ to make the band sound good.
BTW, most of the time with using my Eden WT-400 pre-EQ DI (my amp was modded at the factory to give me a pre/post switch, the original was post-EQ only) or using my SansAmp BDDI, they wind up setting the EQ flat with occasionally just a touch of highs trimmed.
John