General: Kashimax Double Strap Question

Evening all. Right, here's my minor dilemma. I've a pair of Kashimax double straps, about a year old, not a hell of a lot of use, very good knick actually. I was told recently that you can put Brooks cream on to strengthen them, fine and dandy, did it yesterday afternoon and went for a spin with the lads last night, when I went to skid or skip stop my right hand strap kept slipping from its clasp when I put the pressure on, I gave them a wipe to remove what excess there may have been but it didn't help, today they're still slipping when pressure is applied, instead of the Brooks cream protecting them I'm beginning to think it's fucked them up royally.....

I'm picturing them going thru the clasps wrong,