Now that I have a strictly pitch/flip combo I am going to put some PowerPro on it and back it with regular line.  How much backing should on put on the spool?  Just enough to cover the spool at the bottom, etc. etc.?  Also what knot does everyone use to connect the two lines?  Thanks

I have some 40 lbs Power Pro on a bait caster and used the 12 lbs mono that was on the spool for backing. all you need is enough mono to cover the spool 5 or 6 times. I used the uni to uni knot that was on the sheet of paper that came with the Power Pro and it has worked fine for me.

Since you're using it for pitchin and flippin , you could use 1/2 mono and 1/2 braid to save some money.

I fill my spool 1/2 way with 14lb mono then the rest with braid or floro, whatever I'm using for flipping/pitcing.