I imagine a Ralph would be as sketchy as funk on the front in anything other than hardpack. I use Ralph on the back only for this reason.
Agressive ‘positive engagement’ at the tyre edges appears to be what you are after (from reading between the lines here). For this I can recommend a Nic – although this has probably been discredited somewhere above, for a range of too heavy/draggy/sketchy/whatever reasons.
In the true spirit of STW, though, this is the front tyre I use, so it must be the bestest.. 😆
I tend to lean the bike right over and rail the edges (like a BOSS 😆 ) (probably in my imagination only) . I also avoid wet rocks, or roots like the plague, cos I’m a total mincer. For this a Nic is perfect – and I run one on the front of all 8 MTBs I own. Read into all that what you will.