I’ve had 5 or 6 hard rides on my Mattoc Pro now, including 1 at LLandegla (for what that’s worth) and a day in the Lakes (4500 feet of descending). No need to overtighten the stem bolts. 5nm is fine (I even used a torque wrench…)
I was set on buying the IRT since everyone seems to, but I’ve not felt the need for it yet. I usually run a lot of spacers/oil in the air chamber on my forks to help them ramp up but I’ve not felt the need yet on the Mattoc, the lsc, hbo and sag are working well to keep the fork high in its travel and supple enough. I will probably ride it like this until the next lowers service then try the IRT.
The tool kit is worth it if you care at all about keeping on top of maintenance or want to do it yourself. Even with the kit it’s still less than £400 for a really good fork.