Boge 510 cartos are notched across the center post to help air get to the bottom hole and my Joye brand 510 manuals have 4 notches in the edge.
My Deluxe Fluxomizers I have not tried yet are at home - I can't see what they look like.
And when vaping a manual, press the button in 1-2 seconds early, then start dragging slowly, then let up the button just before the end of you drag, finish drag, and inhale.
So try some cartomizers on your manuals, and you could also try a normal 510 atomizer and drip tip for testing juices (or some like to vape that way - lots of vapor). You want a standard resistance atomizer.
Because of their very short charge (180mah) the short 510 batteries have a short voltage plateau where the voltage is good and then power drops off at the end as with most batteries. The Joye 510 mega xl manuals are long but 280mah and have a longer good voltage plateau.
Other options...
But the voltage is around 3.4v on a Joye 510 and that's a bit weak compared to a KR808D-1 where the voltage is 3.7 volts (3.6 for some), and KR808D-1 has many 2.5-2.6ohm cartomizers (the low end of standard resistance) and I think can give vapor more consistently but I recommend the standard aka 78mm batteries for 120mm ecig. I actually recommend Vapor4Life manuals (for the 10-13 second max drag allowed vs normal 5 seconds) but the cartomizers from Bloogplanet or SmokelessImage is you want easier drag and more vapor. They and I use juices that are 80PG/20VG in these and I use some 90PG/10VG too.
Alternately
The big 3.7v 510-threaded batteries like the Riva 510 kits at Liberty-Flights.com (press the 20% off first, upper left front page, and then look at the prices) - they are higher voltage than Ego and will get more vapor out of 510's stuff (and in addition can use the hotter LR stuff). BTW never use an EGo or Ruva charger to charge slim 510 (too many mA and can damage slim 510)
Another 3.7v option would be a $20 3.7v mod box (add to that a pair of $5 protected 14500 batteries to swap and a charger for those which would be $10-12) and you have a nice little box mod (see ECF Buying & Selling/ Modders and Accessories section - like Krimson Kustoms is one who makes those).