This is the sanest comment on the thread by far. You and your lawyer need to a) demonstrate to the co-founders that you understand how options pools are usually

This is the sanest comment on the thread by far. You and your lawyer need to a) demonstrate to the co-founders that you understand how options pools are usually created, and b) understand by what mechanism the co-founders intend to dilute you disproportionately to themselves (see btown's comment for some ideas). The good news is that you are already probably 37% vested, and they have chosen to co-locate their operations with you, so you should be in a strong position to negotiate.