I'm certain I posted this in post #2 but Danny deleted it so here goes again! The ends of all runways in KEF are ungrooved in the last 900m and although BA may be perfect on the runway it can be zilch on the last 900m. I had a 'near grass track' experience there a couple of years back in exactly the same place which prompted KEF ATC to actually own up to the condition of the ends by NOTAM as it was a well-kept 'secret' before
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I assume the lack of grooving has something to do with the run-out on the RHAGS but I am not sure?