Antares and M4

I was hoping to catch some nebulosity around Antares and Ro Ophiuchus but there are limits to what I can capture with this modest set-up. No matter what I tried in Photoshop CS5, after stacking 25 subs in DSS, the 20 sec exposure at F/3.2 (1000 ASA) was not enough to show very much of it. M4 is showing nicely, though. I may try again with more subs and ASA 3200.