The ratchamatic lower is a nightmare! My son had a new 16 at the Carnac Eurocat regatta last year and spent the whole event trying to get the cleats at the right angle, got all stressed about it and didn't enjoy the event at all!
We spent some time with little plastic wedges and have eventually got it right now [one setting for all winds]
For some reason, this flashy/expensive piece of kit does not hold the cleat at the right angle.