I've been using the Energy poly bushings for a few years but whenever I go to regrease them I find the front sway bar is usually binding badly and the little grease channels are full up of sand and grit. I think it's causing the problem I have with the tops of the front end links snapping off.

Is there some special grease or trick to try before I go back to Toyota rubber ones? I've tried the Energy Formula 5 grease, Silamaric (silicone dry film plastic safe brake grease), and a couple others, and tried Strongflex poly bushing graphite grease this time but havent checked on it yet. Is my sway bar slightly bent or what? Seems to be some sideways play in it that pushes all the grease out. That front ones seems very stout and hard to bend though.

I would go back to rubber. One less headache.

You could try some of the techniques used in this video: How to Fix Polyurethane Bushing Squeak Permanently - YouTube