So I've been testing RRD40/47 in my glasses, 3.25" in diameter. with Ecosoya CB-Xcel soy wax.
I've found the following -
RRD40
7% FO - great burn pool, HT is not that great, but could be because of the wax, shrooms, but keep cutting to 1/4" for burns should help. No sooting on glasses, flames consistent, no smoking as well.
8% FO - great burn pool, HT is better, shrooms a little more, but keeping to 1/4" wick helps. No sooting on glasses, flames great, no smoking as well.
RRD47
7% - jars is hot, but not too hot to hold, burn pool is full off the first burn, so I'm guessing it's too large of a wick. HT is decent, keep shrooming to a minimum by 1/4" snips. A bit of sooting on glasses, flames a little too large, no smoking though.
8% - burn pool is full off first burn, jars is hot but not too hot to hold. HT is good, shrooms so 1/4" snips. Soots on the glass, flames large, no smoking.
Hope this helps out.
I'm testing out some HTP as well, so I'll keep you posted.
I feel as though as CB-Xcel is a hard wax to get really good HT.