Most "stimulative" syrup ratio?

[Murox]

Wrapped in cling film and a hole in the bottom (placed on the top bars), does not go hard in my experience.

If hard, remove from hive, uncover it, a fine spray of water ,cover it up as above.. .Will loosen it up.

Yes that works well. Sometimes I just gather up all the "hard" bits and just add water and a little thymol to a container and when its 'syrup' feed it back, never any waste with fondant.

 

[Murox]

I use 1.5:1 or even slightly thinner. Simulate nectar and used for build up rather than storing.

Spot on. nectar is very thin and watery compared to 'standard 1:1' .