If I'm not mistaken, I believe I remember when you got the HPA-2, or I saw pictures of it some how, I think. Glad to hear your enjoying the combo together, and I do understand about the "brain burn-in" also, because when I switch from the three Grados I own, I have to get use to each of them again, and this takes a little while, but I'll listen to each one for days at a time. When you get the chance let us know how you like the TTVJ flats with the 80's
You are not mistaking Joseph, I do own the HPA-2.
Although I used my stock Little Dot 1+ instead of the HPA-2 for this, I did try the TTVJ flats on my SR80is, and the first two things I noticed were that they had more bass extension and less treble extension.
Now, being that I always thought that the SR80i could use a little more bass, and that they could be a little on the hot side, especially with lesser recordings, the flats represent a win win upgrade. Also, the fact that a well trained chimp could perform the swap in under a minute, that it's relatively cheap, and totally reversible, makes this a no brainer.