I have some unpleasant, but relevant experience. tldr: usa PVA glue or hair spray to fix grips in place, you can inject vodka/spirit with syringe into grips to remove them, add some beef to bars with plastic tape as needed.
My previous Easton Heaven / Hypergrips combo was a pain to setup. Extralite grips don't hold in place by their own at all, so I had to glue them on. Hair spray did not work, so I used PVA glue, but even this took two attempts because of residue fat/whatever, nothing some vodka rubbing can't solve. Been fine for a couple of years. Now, several months ago I've upgraded to Darimo bars and these seem to have a tiny bit smaller diameter than Easton, which caused even more pain, for a whole week the following became my daily routine: inject vodka into grips to slide them off, rub residue away from both surfaces, leave to dry, glue grips on. I've tried various mixtures of strong/weak PVA, at best this lead to partially glued on grips. This continued until I decided to wrap bar ends with a layer of Tesa 4289 tape (which I also use for rims), then grips stayed in place after a mere hair spray. Since then, I've been through several heavy rains and grips do not slide or come off in any places.