I think if you O'd well on 50, there is no benefit to increasing your Clomid dose - it can increase the s/e (such as thinned lining and hostile CM) which would do more harm than good.
My ob usually does 2 cys of 50 and then 2 of 100. I know a lot of drs will test the 7DPO and if the number is good, will not increase at all and do up to 4 cys on just the 50.
I have a friend on another board who got pregnant her 3rd cy on 50. Her progesterone was actually not very good, and they were planning to increase her to 100 for month #4 when she got her

(her progesterone was only 8.3).