O.K. 2012 DL 650, I had a 2006 with professionally set up emulators.
2102 on relatively smooth sealed roads with Intiminators and STOCK springs felt a little harsher, but a lot better over bumps and irregularities.
Off road, mine felt good from the get go, the same faint harshness as on seal, but it basically got no worse even on pot holes and badly rutted sections. I went faster - no difference. I could even brake acceptably well on gravel corrugated surfaces which the K6 with emulators would never do. (The K6 would go corrugations them just fine, but braking at the same time, noooo).
Check everything else first. All the AceRider mod does is fix the slightly harsh on smooth seal thing and I suspect trades off some of the ability to soak up the big ones.
First, check that the Intiminators are actually sitting flat at the bottom. Needs a good torch and a better eye, but rotating the springs should seat them.
Suspension Fluid - Pvdwiki
Not all 5Wt oils are the same viscosity. Castrol 5W/Motul 5W seem a bit thick to me, but after a couple of weeks - get beat up enough that it smooths out
Also, make sure the front isn't binding, which is a possibility , particularly if you fitted a fork brace.
Loosen the LOWER tripple clamp bolts and the front axle pinch bolt, bounce the front end a few times, as far as you can. Retighten.
Check the oil level, with the front fully extended springs (but not spacers or washers) in, oil level should at least 170 mm from the top of the fork leg, ( and probably nearer 190mm).
150mm for the max. travel + 15mm for the space the top cap takes up + air gap left at full compression, probably needs at least 20-25mm air gap. Too high an oil level it will also feel very harsh.
Preload increased with the Intiminators - they take up 15mm at the bottom of the springs, back it right off, wind one in side until you feel it take pressure then one turn in, then set the other the same (There won't be the same definite 'pressure' change on the second one.
You can fix the preload adjuster range by making new (shorter) spaces with PVC pipe. I'm 90kg's and at ~40mm with that sort of adjustment. But for a start, get it feeling right.
That does seem like a lot of preload for your weight. Did you unweight the suspension completely before measuring the baseline ?. (Front wheel off the ground)
Finally after checking everything, ride the bike a couple of 1000k's before you play further, mine smoothed out a lot after a couple of weeks use. A combination of oil thinning and things bedding in I suspect.