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-lap to 600 or 800, not 1000. (I'm in the debate now!)
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oops, that was my bad, I have been reading the mirror finish ones this morning, I did mean to say 600-800.
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little to get a sure slow stream of water, its not powerfully rushing at all
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It doesn't have to be really moving, but in my personal experience, the returning water is fast enough to hit the other side of my res and makes a fair bit of noise. Mind you, it is the crappy CPUFX/OCH one, so it doesn't really have to move that far... though, this does sound a bit weak, make sure the water isn't traveling any farther than nessisary, and it could be the heater core. Mind you, take it one step at a time, and lap and remount the block, then we will see if that made a difference. As for presure, just do it untill it is firm enough that you cna't shift the block in any direction, but be carefull, the core is an easy thing to break
edit: here is anouther lapping guide, but this person uses up to 1500 grit, for a mirrior finish
http://www.blargoc.co.uk/guides/lapping/index.shtml
-WireX