IMHO the core thing that needs to be addressed is breaking the 'need' to be smashing the dps button mindlessly.

Right now, there's just no reason not to be smashing Glare/holy as fast as the GCD will allow for 99% of the time you spend in combat. Until that fundamental detail changes, things aren't going to improve much IMO.

As for how to do that, that's the difficult part as I honestly don't think there's an route that's going to suit everyone.