Scott35, I guess I'm a little confused about what you want to do with your 555 crossbuck ckt. One thing that I tend to do with my 555 ckts,(that I don't believe they show in the data sheets), is put a 1N914 or equiv. in parallel with my discharge resistor(2,6 cathode,7 anode) so that my effective charging resistance can be <= my discharge R for a <= 50% duty cycle. The stability is largely dependent on external components but I never really put 555 and accurate in the same sentence. Of course, this one in my pacemaker is arrrrrrgh.......
