I wish this was helpful, but amiunique.org calls out the values for canvas, fonts, etc. as unique when running the blockers. Maybe this is because it's randomizing every time, but it makes the amiunique test pretty flawed...
amiunique.org is just a database of fingerprints (size of which is governed by however much traffic they get).
If you're showing up as unique it's either because:
1. your blockers are randomising each time
2. your blockers aren't blocking everything and what's left is still enough to uniquely fingerprint you against the database of fingerprints they have.
If it's 1 above, that's fine. If it's 2, you may need more (or better) blockers.
Also, it obviously helps from the get go if you're on a bog standard platform like Windows and using FF.