H8-80 is the only DHS rubber that can be played unboosted imo. But it's too soft on the FH imo, and it becomes unstable during harder loops which is undesirable. For BH I reckon it's a good rubber for sure.
I’ve played a few DHS rubbers, and only boosted 2 or so, the memorable ones were H3 Neo 2.15mm, and Skyline 3 provincial. I had no issues playing unboosted H3 Neo (various versions), H8 and H3. Ignorance is bliss!!
No doubt boosting is the way to go though, but I’m to lazy to do so, got mixed results when I did some boosting tests, sometimes I felt no difference at all !!! (Skyline 3 provincial felt great, a good boost job for once!! )
When DHS released H8-80 I bought about 4 sheets over a few months, 2 @ 37 degree and 2 @ 38 degree. I like this rubber. It’s definitely not trash.
For high power shots, it could be the Viscaria that contributes to the ‘unstableness’ rather than the rubber. The same for the long5 blade, I found that it was harder to judge how far the ball would travel when you really put some power into a stroke, that combined with my, at best, average stroke technique not putting enough spin on the ball to drag it onto the table caused ball to fly long.