You don't see mash hopping mentioned because so many people have tried it and found it doesn't work that nit's gone out of vogue. It was one of those things that sounded cool but did nothing for the beer.
Gone out of vogue...that is the sentiment I was thinking of.
I definitely could taste that hops had been imparted to the runoff, even though the never got above 170 degrees. So it seems like it adds something. I guess that you all are saying that it gives nothing distinct, in the way of hopping, that other methods can't provide?
When I was doing a small mash for another experiment, I threw some hops in just to see what they did. Even with 1/2 oz of pellets in a 500 g mash (~5 oz for a 5 gal batch) I couldn't taste any hop bitterness or flavor in the finished beer. IIRC I used Chinook.
Interesting. Are you saying you were comparing two different beers and you added mash hop to one and not the other?