Mycorihazae fungus grow in the soil and build networks that work in conjunction with your own root system.
They are symbiotic with the plants roots and the plant feeds them and they feed the plants.
Molasses can help to keep them alive and thriving in your soil.
I wouldn't bother with liquid glucose as you yourself said before the plants cant absorb this sized molecule through their root systems.
The molasses also helps to create micro herds that are also beneficial to your soil and root systems.
All though the liquid glucose would help to feed the bacteria it may also feed unwelcome bacteria.
I found with molasses that using 1 dessertspoon in 3 litres of water was plenty and that this created a good balance and didn't encourage shitty soil,mould or a crappy smell from having to much molasses in them