Thanks for sharing your thoughts Creeping Death, I am also using the yellow stripes on the ground to start holding the grenate and this works like 9 out of 10 tries. However, sometimes it goes wrong because of me, or I get a boost from a guard before I get the boost I should be getting and runs like this so far ended up in 14 (!), just got another one, failed 0:23s and numerous failed 0:24s. It's a combination of bad luck and a lack of concentration, and it's obviously a lot more due to the former...
-Matthijs