I've never done what you are doing JJJ, but I do recall seeing on Backyard Blitz that the guys compacted some gravel (approx 10cms) at the bottom of the post hole to allow for water drainage, and then they poured the cement mix all at once, after having nailed some support struts to the post after first getting it nice and vertical.
I think they drove some wooden pegs into the ground to fix the support struts to, which were at right angles so the post was vertical in both planes.
They also used the rapid setting stuff as they had to do the job over 2 days.
Where the post exits the concrete above ground, they also sloped the concrete away from the posts, so water would not pool on top of the concrete (if it were level or flat).
Cheers
Dennis
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