I second Phills comments.

I've been down almost the exact same road (with minor differences) and have come to the same conclusions.

Indeed ...

-1- you want 1:4 purchase on the jib
-2- you want the blocks on the pole to be well fitted so that blocks can't realign themselfs and have the lines rub
-3- you want to have swivel cleats.

I also found that you don't want the swivel cleats (jib sheet) to be too far inwards towards the mast.

Wouter