If you're using a calibration disc to calibrate, you're going to get a reference level image, which will appear darker than what a lot of people are used to. For the time being, see if your PJ has different modes and, since you're going to be having some ambient light, I would go with the "bright" image preset if your projector has it. Barring that and assuming you have the brightness set to a level you are happy with (ie. you don't want to go any higher), mess around with the gamma settings. It can be tough to eyeball that, but get it to a point where too low will make the image washed out and too high will make the image too dark. You should be able to see good shadow detail without making the image too washed out. Hope that helps.
Video: Optoma HD3300, Panamorph UH480, Darbee Darblet, Samsung BD D6700 Blu Ray player, DIY Seymour Centerstage XD 138" Curved Screen
LCR - Tannoy DC12i, Sides - Tannoy IW63, Rears - Tannoy Saturn DC6ti Bookshelf, Ceilings - Tannoy CMS 603DC (TF), Tannoy CMS 601DC (TR), 3 Micro Marty/1 Full Marty DIY subs
Amplification: Emotiva XPA-3, Emotiva XPA-2, Outlaw Audio 7700, 2x Inuke 6000DSP
Receiver: Anthem MRX 720