Talking single flavor mixes...SC and INW French Pipe are both nice, I prefer the SC. Haven't tried Hangsen's. It's on my to do list.
I'm not as fond of INW Dark for Pipe, though it's decent.
INW Vanilla for Pipe is also nice but weaker than "usual". I mix that single flavor at a crazy 10%, but it works for me.
INW Black for Pipe is rich to the point of being cloying for me, but I've briefly enjoyed it at very low %, I just can't vape it for very long.
Also try the "Cubanos". SC's Cubana is very nice, and actually reminds me more of pipe than cigar tobacco. INW Cuban Cigar Tobacco Absolute is also nice.
Generally, SC 3 % or lower, INW 3 to 5% (excepting the Vanilla for Pipe). The Super Concentrate flavors start getting squirrley with harshness and unpleasant aftertaste above 3%. If you venture into the Hangsen's, I've found that their tobaccos tend to need higher %, sometimes up to 8%.