get a rigid vang from Garhaurer.
and you'll solve both problems. Forget the boomkicker since you'll still need to buy a soft vang. I had a boom end adjustable topping lift that was fine till I got a new main with larger roach and full battens. Totally inconvenient, always hanging up on the battens because it was too tight or slapping against the sail because it was too loose. So I got the rigid vang and....voila!.... no more issues with the topping lift. I tied it off to the backstay. For the adjustable conversion you'll need to shorten the toppping lift, install a bullet block, fix a cheek block to one side of the boom and ane eye strap on the opposite side. A vee or clam cleat ahead of the cheek block will secure the 5/16 control line that is run from the eyestrap up through the bullet block, down to the cheek block then forward to the cleat.Pricewise, the rigid vang will cost less than the soft vang/boomkicker set up, and 30-40 bucks more than the soft vang/adjustable top combo. But.... trust me.... when I tell you the rigid vang is the way to go. You'll love it.