Lazy Jacks

I have just implemented the lazy jacks modification in lieu of the original topping lift, as advocated by Dennis, Russell and Charles (see 'Kicking Strap' thread). I used their dimensions for fitting the bullseyes on the boom i.e. one set 65cm forward of the end of the boom, and the second set mid way between the two cleats on the port side of the boom (topping/reefing cleats). This is a great improvement on the original single line from one side of the boom to the other, but it seems to me that the lazy jacks are set a bit too far aft, and not gathering up the bulk of the mainsail when dropped. I am wondering whether the forward lazy jacks should be mounted further forward, or whether things might be better with a third lazy jack mounted about a third of the way along from the front of the boom. Does anyone who has implemented this mod have a view, based on their experience?