I was final fitting all the pieces of one side of the HS and, even though there's an HS-909 shim on the front end of the center HS-904 rib, there's still a gap between the rib and rear spar. Should I make the HS-909 from thicker material or make a couple more? I didn't actually have to fabricate the HS-909s. They came in a separate baggie in this kit that I picked up from a former builder. Maybe he made it from stock that was too thin??? Any advice is welcome. Thank you.