May I ask you is fine, super hoeflick = (would you be so kind as to write...)

"could you please" has undertones of aggression, as in "could you please get out of my way.

I agree with Timo. 'could you please' could be taken as being pushy, but it does depend on how you emphasize the word 'please'.

'Would you please 'blah, blah'' would also be super polite, again depending how you emphasize 'please'.

Now that I think of it, pretty near all of the politeness in these can be sucked out by how one says the word 'please'. :)