The only thing that I would add to Old Smokeys technique is to apply max thrust slowly and smoothly.
I am assuming that you are at a safe altitude and terrain is not a factor. Applying thrust slowly allows both engines to spool up symmetrically. We have all flown old aircraft in which either the engines (maybe intermixed) do not spool up together or there is a significant thrust lever stagger. The last thing you want is asymmetric thrust near VLS. Also slow & smooth application of thrust will reduce the chances of engine stall/surge.
S&L
Edit to add that when I do these from the stickshaker at approx 15,000ft the height loss is approx 1500ft so your 3,000ft at high altitude sounds reasonable. NB this is not a minimum height loss technique, it is a keep it safe technique!