Do you like your Springfield, otherwise?
I have a XD40SC that can conceal pretty easily. The shorter grip makes the difference, along with a good holser.
I also know some folks that conceal a full-sized XD, so maybe a different holster would help you?
Move to a single stack and go 1911. It's fairly easy to conceal a full size 1911.
Ruger Sr40c.
Barretta Px4 subcompact in 40.
I really like the springfield, I feel like it is a reliable gun, and it has a nice design to it, and I like to dual safety. How much does a XD40SC sell for? and any idea what type of holster they are using?
The XD holster it came with tends to "fall away" from my side. Probably due to the HUGE belt loops on the thing. I imagine with a wider belt it would stay more against my waist...
I'll second the suggestion for a single stock 1911. It's amazingly concealable. But the note about the right holster is equally applicable. You might just need to find a holster (or belt; many people forget about the belt) that works a little better for you and your current gun.
The provided plastic "holster" is worthless! A cheap Fobus is better. I picked up a leather holster from JBP that holds it nice and close. Looks "classy" when I OC, and an untucked Polo serves for an impromptu conceal.