partial (mini) mash og very high

Just getting back to brewing after 2 yr absence. decided to make stout
using a variety of receipes. Usually I do extracts and mini-mash. I haven't
worked up to a full mash yet - (for unknown reasons).
8 lbs light dme
1 lb flaked oats
.5 lb flaked barley
.5 lb carmel 120l
.5 lb carmel 60l
4 oz choclate
2 oz roasted
4 oz malto dextrine
1 oz golding 60 min
1 oz fuggles 40 min.

5.75 gal boil.

Did a mini mash with the grains. There really weren't enough grains in retrospect but it seemed too much to just steep at the time.

So I think this is probably an imperial stout looking at the ingredients
now. what bothers me is the OG of 1.082. It's pretty high.
I put it in the fermentator ~ 10 min ago.
Should I try and bring the OG down?
How -- add more boiled & cooled water? How much?
Or I'll probably just relax and wait until this batch is done - or gone.

Thx

If you want you should add about another gallon of water.. but If you like High gravity beers leave it alone... That is all up to you.. If you want it more in the 1060 range add a gallon.. that should do.. but do it in 1/2 gallon incriments then mix and take another reading.