I think its a true regurgitation if the snake gets the food item down to its stomach, THEN regurges.

If hes getting it half way down or part way into its mouth and then readjusting (spitting it out to swallow it in a different orientation) then I wouldn't worry. I have a few snakes that will spit an item out if its not going down well, and then start at the other end or in a different spot and get it down.

I would also second feeding him inside his enclosure. It really just seems to cause more problems than anything.