And I know you don't want me to keep them because it's a huge unfair advantage...
So lets think about this for a second.
In $sport you may advance through different weight/skill divisions and as you do so regulations allow you to use different techniques as you have earned it through experience. You then choose to compete in a division that is back down the ladder where regulations are in place not allowing certain techniques to be used for safety sake(generally). Why should you be allowed to use these techniques and your opponents
in this division not be able to?
You've been allowed them when you were a higher division yes, but you aren't any more. You got to use those techniques in the upper divisions because you were rewarded for your achievements/skill. however you
CHOOSE not to play in that division any more, thus you need to abide by the regulations for whatever division you are currently playing in.