i dunno what you mean by the whole 50% to a lateral angle of paethagorus's theorum etc....

but jus do it so it fits comfortably covers your back teeth at the back.. but doesnt aggravate the gums.. if it does cut it some at the back till its compfy and jus keep workin at it till you can stick it one your teeth and open your gob witout it coming off your teeth.. boiling hot water bout 11 12 secs ...
hope it helps
peace