This is becoming the mechanic for us. I have discovered that with practice, it is easier to start 3BLX and move than start POP. If done properly, on a collision, there is no difference on angle relative to the play, you're just looking at it from the opposite side. It does require a better read and a little more distance to cover, but the few times there are plays taken from the 1B side (and still, just as good an angle as 1BLX) are far outweighed by the majority of plays that are better at 3BLX.
As for the distance, I have discovered, again, that practice is key. I have a clip of me in a game where there was a swipe tag that I took from 3BLX. The throw came up the line towards third, and the tag was actually administered about 6 feet from the plate. I noticed, watching later, that I started about 10 feet from the plate, but moved closer as I saw the catcher move up the line, to where I was about 4 feet from the plate--and I don't feel that was too close, thinking of what I saw at the time of the play. Point is, the ability to merge instinct with practice is better with this method; with POP, it seemed to me that the decision and movement weren't as intuitive.