> The only particularly disappointing thing is that the battery drains mega fast while suspended

Not particularly helpful to you necessarily, but I was able to solve the battery drain on windows by tweaking the deep sleep and hibernation settings and I'm now reasonably confident that if I close the lid on the laptop for the night it'll have a similar level of battery left when I open it in the morning.

I think everything defaults to intel's "not actually sleep" sleep mode which destroys the battery like nobody's business