Watch out, the Alt 8 has basically no mids and fairly pronounced high mids as a result. I found it quite hard to get a good tone with through the regular array of tube amps.
Yeah the ceramic Nailbomb is actually fairly tight, the alnico on the other had is very muddy and not tight enough in the low end for metal stuff.
As mentioned the Alt 8 is very tight, quite EMG 81-ish. I've got one for sale actually if you're in the UK/EU?
I am recording a band at the moment tuned to drop A and my ESP M1 NTB with Duncan custom custom SH-11 sounds tight and punchy.
I put a D bass string on for the low string. The M1 originally had an EMG 81 but sounds much better with the SH-11.
I have an SH-11 in my PRS Custom 24 too and it sounds much better than stock HFS pickup.
It is my favourite pickup. It has super tightness but has alnico magnets so is warm and not as harsh as ceramics.
I should be finished guitar tracks today so I could post a rough mix of a song later.
I can also post a guitar di so you can check it with your own rig.