You may want to try bikini zone, even if you aren't getting a rash it helps with the itching. I would be worried about shaving down there everyday as that can cause more irritation since it is such a sensitive area. Also, when you shave use some conditioner, it will help soften the hair and cause less irritation.
The only thing that will help is to either shave daily. Where though do you have most of your irritation?
Maybe you should wax instead?