If your technique is ok and you want more grip, I’d definately get that NN off the front. I guess it depends where you’re riding and conditions etc., but based on personal experience, as others have mentioned the High Roller 2 in the decent 3c compound or Hans Dampf in Trailstar are both excellent. Personally for more aggressive cornering in trail centres, I prefer the squarer edge of the HR2, but on natural trails, the HD is great – only problem I’ve had with HD’s is the base of edge knobs getting torn (according to LBS, this was a problem that Schwalbe have largely sorted on latest production)
One of my favourite tyres at the moment is my Mavic Charge – its tread is almost identical to a HR2, but the compound is even grip pier. I’ve deliberately tried to provoke front end drifts out of it, but it sticks like s**t to a blanket – it’s also very nicely damped, noticeably more than the HR2, which is still good! Only problem with the Charge is the extra rolling resistance – but this is only really apparent on Tarmac or smooth hard packed trails, and it can be negated to some extent by fitting a fast rolling rear, like an Ikon, Ardent Race or Racing Raplh (I’ve used the latter combo in the Alps, and only wished for a bit much more rear end grip on the super steep slow bits – 90% of the time, it was a good combo).
HTH