I'm always just near the instance entrance, so after killing the 3 groups, inevitably there's ALWAYS at least one boss just close to my group. So I just make sure shields are up and spam the attack macro I gave you. It'll be at least one less charge but sometimes more than one are just there. Don't wait to change mount for too long. If first charge is "heavy" start running for fresh mount at around 20%. Just keep one targeted and spam attack and shields while doing so. Sometimes I get as much as 3 unmounted but always manage to do it without wipes. Sometimes I have one dismounted killed but never ever had to get a fresh mount on an alt and did a lot of runs both heroic and normal.
Hope it helped.
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