801 is fine. Not as popular a threading as 510 or KR808D-1, not as much stuff available for it, few direct large battery upgrades. Some people like 801 atomizers a lot for dripping (on manual
batteries only). I have never tried 801.
I don't know if there are manual batteries for 801. Most people here use and recommend manuals - safer from being danaged or killed by juices leaks and easier to get a good hit.
10-12mg is a level similar to ultralight cigs. You could try 16-18mg. Or just try other juices. What PG/VG are you using? PG lets through the most flavor and the most of nicotine's TH and irritation. VG dulls everything PG lets through and makes thicker visible vapor. I used to use 70PG/30VG but now that I am using cartomizers I find 80PG/20Vg keeps them working well longer, especially light clear juices that leave little or no flavoring sediment.
Remember to smell the vapor - most of the flavor is in the aroma, same as with food. if your juices don't make you feel ahhh then try other juices.
Clean your atomizers - atomizers will get gunked up and weaker if you don't keep them clean.
Try cartomizers.
A slightly stronger slim model might be a KR808D-1 - check out SmokelessImage Volt. The manuals (available in some colors) and totally sealed though their button is tiny. I recommend their 78mm batteries. You can use a plastic or delrin dip tip (LiteCigUSA.net) as a mouthpiece on the carto if you like a slimmer end. Vapor4Life is another KR808D-1 you could look at and I recommend their standard size manuals. They have a mostly sealed end on the manuals, a larger button that is easier to press, but do not have the rubberized coating of the Volt. These are real 3.7v minis and they are 2-piece (use cartomizers). Keep a carto damp and it will be good for 4-7 days or more. To test juices on manual batteries, use a DSE901 atomizer and the same 510/901/KR808D-1 drip tip I mentioned above (dripping on an atomizer is not recommended for auto batteries) The KR808D-1 models can use cartos from Vapor4Life (some of their flavors are overdone but I love some), SmokelessImage, Bloogplanet, Halocigs G6
To see even bigger models with long battery life. go to Liberty-Flights.com, press the 20% off upper left front page, then look at Riva 510 and Ego. These use 510 threaded stuff. Boge blank cartomizers are the most popular cartomizers. Few prefilled cartomizers are available for 510. These fat battery models and other can also use the hotter low resistance atomizers and cartomizers.