sorry but it sounds very stupid to me
... What I learnt and noticed is that once you select V/S mode, selected vertical speed governs the engine thrust..
On economy climb, it depends what is your company policy.. economy level required is set by the airline and is indicated by CI.. depending upon CI, OAT, weight etc most economical climb would be achieved if you fly the ECON speed with thrust levers in CL detent...
individual tricks are useless and does not serve the purpose..
at my best
cheers