Not picking here, just curious, but why do you not use the safety? I carry a couple different guns during a given year depending on the weather. Mostly it's a 1911 and I've been shooting it long enough that removing the safety is second nature when the weapon is presented to the target/threat. I also carry a Glock, but I've never had a problem distinguishing it from the 1911 so I don't thumb for the safety when it's what I'm carrying. On the rare occasion I carry the HK, the safety is similar enough to the 1911 to not be an issue. Of any of them, I guess it'd be the easiest to NOT use the safety on, just shoot the first shot double, but for the life of me, I can't understand why you would leave the safety off. Again, I just want to know what your reasoning is, not trying to bust on you or anything.
side note: keep in mind, I don't switch from gun to gun on a daily or even monthly basis, just when the seasons change to help facilitate concealment. As of late though, I got a new IWB holster and have been carrying the 1911 exclusively now, even though before, I'd have switched to the Glock for summer carry.