Obviously you're not me and you may be significantly stronger on the bike than I am but here's my power going up a local mountain road that averages about 6 or 7%



Pretty much low 200s. For me at least the limiting factor seems to be HR on steep hills. I feel like I can put out more power on flats or downhills and that's based on looking at power numbers - I always assumed I'd put more out on a hill until I tried.