@badmephisto: DON'T CHANGE! That's the one I use. I discovered a nice finger trick that shaved about half a second of my original time, which, like yours, was sup-2. I say
discovered because I came up with it on my own and I've never seen anyone doing it like I do, not that I've seen much though
For me, it was the final FRF that bothered me most. So I came up with this solution: Middle finger. While pulling U with your right index during the final R'UR', extend your middle and get ready for an F turn, pull F after you've completed the R', turn your wrist outwards for R, and do the final F with your index. It should feel
very natural after a little practice, almost like a U2 double trigger. Took me about 5 minutes of non-stop V perming to get the feeling right and the execution smooth. And now I can just do it subconsciously.
I fell in love with this finger trick so much that I changed my N perm so I could use it

Here's my N perm by the way: RU'R'U-lUFU'-R'F'RU'-RUR'Fl', the finger trick is in that last bit.
So, at the end of all that, if this what you're already doing, then change your algorithm

If it's not, I shaved half a second with this one fingertrick, you should get the same results.
By the way, do you
really do it as R'UR'd'? I know that's how the algorithm appears in most websites, but I found it
extremely disturbing, I just do a U' and y cube rotation simultaneously, which is very natural and very fast.