Mxb - I recall that Rotterdam is a fast and flat course - sounds like a good one. Are there any tweaks or changes you are making to your plan for Rotterdam that differs much from P&D70 , or from the loose version you used for Amsterdam. Interested to know what did or didn't worked well for you.
I'm not sure yet, to be honest. I need to find the time to sit down with my Garmin data and work out what went right and wrong with training. My initial impressions, without having done that analysis, are that
(a) I kept my HR a little too low during long runs - by which I mean, at the lower end of the endurance range (around 73% MHR);
(b) I was not rigorous enough about running at my marathon pace in parts of my long runs, and
(c) I don't think I did enough running at LT pace.
Things went well the first time round though so hopefully starting from a higher base will enable me to knock 5 minutes off my time by just following the same plan again.