I tried priming with royal jelly but I could not see any difference between the results and when I used the Chinese grafting tool, which, as Michael Palmer pointed out, picks up some of the royal jelly. Jay Smith who, being a student of G.M. Doolittle, started out priming ended up deciding that it did not help at all.
"We used to prime our cells with bee milk but, after careful examination, believe it was a detriment, for the first thing the bees do is to remove all the milk we had put in. Grafting in bare cells is better-or rather not so bad."-Jay Smith, Better Queens