All grain recipe over boil.. add water to fermenter?

[Brazbrew]

Hi, I am realatively new to all grain, this is my 6th batch. I seemed to be way low on my preboil gravity, so i opted to extend the boil to 90 minutes. ( the batch was estimated at 10% above the final volume I wanted anyway so I thought i would be ok). as I turns out I boiled down a 25 liter preboil volume to about 17 liters. The OG was 1.070!!!
So my question is.. ferment it and test it out as a significantly stronger version of the summer wheat ale that i wanted to brew.. or should I add two liters to the primary fermenter ( boiled and cooled?) to bring up the volume and thin out the beer?
I am also worried about the yeast performance at that gravity level, it is Fermentis US 05 and it is not designed for high graviy beers..

Thanks in advance for suggestions!
Nate

 

[el_caro]

No harm in adding water as you have indicated to get the OG you want.

 

[chickypad]

As was stated no harm in topping off to get the gravity you want, but I wouldn't do it because you're worried about the 05. It's alcohol tolerance is in the 11-13 % range so no problem with a 1.070 beer.

 

[Brazbrew]

Thanks. The last time I brewed this recipe I had active fermentation within 12 hours and actually had to swicth to a blow off hose after 24 hours. It has now been 16 hours and I haven't seen the first bubble, so I'm a little concerned about that. But I guess tht's good if I want to be able to add water and get a new accurate OG reading.

I think I'm going to add 1.5 liters of spring water to the fermenter to see if i get closer to the OG I was looking for, hopefully that will have a positive effect on the color as well.

Thanks again for the tips!