Guitar effects and PA?

So far my board consists of a behringer "ultra metal" distortion pedal, Digitech "Bad Monkey" tube OD, chorus, MXR eq, and ibanez digital delay, in that order. When I run it through my amp(little 30W roland practice amp) it sounds great. However, when I try to run it through a PA, it just sounds really hollow and weak. The bad monkey od has an amp modeling output designed for going straight to a pa, and when I use that it sounds a little better, but still not great. Is there something I can do to get that amped sound w/out lugging my amp along and micing it or using the line out?