I have shot with dudded tips since the early eighties when perhaps the first, Jensen Cues, started making them I believe. Some years back I had calipers and precision scales on hand so measured and weighed some Elkmasters. Out of a box nine were superlight, I round filed them. At less than forty cents each no pain. Four were real heavy. I saved these to see how they hit but they got lost in a storm before I got around to it. The rest of the tips fell into two very consistent groups. I dudded some but found these played just fine dudded or not since I like a fairly soft tip. When I dud I just compress back to near standard height. I have seen some tips crushed down to where the structure of the leather is damaged, not something I want.
In recent years Elkmaster offers a sorted Elkmaster straight from the factory. They call them Pro's or something and charge a premium for them. Leads me to wonder what they do with the culls. I doubt they throw them away so I suspect that when you buy a box of Elkmaster tips you get a little higher percentage of culls now. Don't know that for a fact, just a suspicion.
I suspect anyone that likes medium hard duds can get a twenty or twenty-five dollar digital scale and a box of Elkmaster tips to sort for yourself and have a lifetime supply, no dudding needed. I suspect those nine super light tips would have benefitted from dudding, the two groups that were in the medium weight range don't particularly need it for my use. Dud, don't dud, I don't care.
I don't like layered tips because of questionable consistency which I have encountered even with premium brands. You find out fast if a single layer tip is good or crap and it is the same as long as it has playing height left. I am easy on tips and use them for years. Rolling dents instead of scuffing leather is a big reason for that.
A bit of tip information that most probably didn't need!
Hu