Everyone says to stay away from DJ jet kits. I am now a believer, they suck to tune. But, that being said.... To get a DJ jet kit tuned right you'll need to do a lot of fiddling. I took my CV carb apart and put it back together about 15 times before i am finally happy with it. I ended up using the DJ kit.
One thing i did learn... If you're stubborn (like i am) and do use the DJ jet kit. Use a smaller pilot jet (my bike didn't run right until i went with a 42 pilot) which is almost insane small for a big twin. I think it has to do with the taper of the needle i used (it was a D402 needle). But i'm very happy with the performance i have after finally getting it running right.
Pilot - 42
Main - 190
MPG - 40-44
I've never put it on the dyno, but i can tell you it runs a ton better than when i first got the bike. Huge amounts of helpful information from this site was my best assist.
Being you're on a sportster you'll want smaller jets than i run, but you do have the same carb. But most ppl i know who run sportsters have a #42 pilot and around a 170 main. Instead of buying the jet kit. I'd open her up, see whats in there. Get your pilot jet set up first (which you may not need to change). Then move on to your main jet. They are usually fairly lean stock, and putting a free flowing exhaust will make it even leaner. Usually moving your main jet up a size or two, then shimming the needle will do the trick and give you the HP you're missing.