I play 9-42s, using Thomastik-Infeld Power Brites. For me, getting pickup height right, combined with very minor adjustments to my amp, I get a tone I really like, with no loss of low end and no wispy highs. I find this gauge to be way more touch responsive than the 10-46 sets I've used for so long. Given the level of tone control possible with even simple rigs today, I really don't see any need to use heavier strings to generate either volume or tone. I like the attack/decay curve with the 9's way more than twangier strings, as I really dislike the explosive pop (excess initial output) of heavy strings, too-hot pickups, etc.
Love the 9 gauge strings. It is all I have ever used period. For the most part I think ernie Ball super slinkys sound the best to my ears on my les paul. However the OP mentioned dunlop strings. They are very good but do not last very long. They do some kind of pre stretching during the manufactoring process that makes them good to go out of the package. But i think it does something to the dynamic of the steel is the reason they do not last very long at all.