Jay - I just use a single wrap of Shimano tape the reel came with and found the braid bites in well.
Jon - You beat me to my next question... my reel is the new SW 18K, with the "bevelled spool lip". I've spolled it just past where the bevel strats, but the line is still inside the spools outer lip by a few mm's... is that about right, or is it slightly over spooled?
In regards to tension on the line while filling the spool... I try to keep it @ 5-6kg of drag pressure and find that it does pack it on fairly tight. I have gone as high as 8-10kg, but damn that is hard work!