The reason for the charge is I'm building threat on him when he hits 50% he does his wing buffet to toss you away if you time it right your charge keeps razorscale in normal position and stops you from taking fall damage unless this was changed, but every wing buffet that's how I stop my fall damage.
For the SW issues I am used to the SW being used only for frenzies or whatever they are called now when the boss hits a low % of HP, so I will get used to poping it more often.
Before the boss hits 50% I warn all my healers I will be facing razorscale to the south I may get knockedback and I told them to stand outside the circle to avoid the punt, but every time I tank this boss it seems like this happens. I got used to charging and poping Last stand to try and give time for healers to re-adjust to the punt and everything. Not only do i have death issues with Razorscale though but deconstructor and pretty much every boss in ulduar they have me MT for so I don't know. Sadly I can't find the parses for the other bosses though.