If you stay in a healthy range, you shouldn't need to up the dose. That only occurs if you're constantly overloading your androgen receptors (ie: going over the range). This overtime, will downregulate the AR.
You can always look into l-carnitine-l-tartarate (LCLT) to help prevent this.
I occassional go 'off' by going onto HCG monotherapy. Once a year or so I've done this since starting. I wouldn't recommend it though honestly, unless you are really in tune with your body.