Thanks for the quick responses

Your quickness does pose more questions though:
1. How do i know if the carto has pollyfill?
All cartos that are not CE2 have filler
2. I have the Krugers and after 3-4 hits on them they are too hot, is the WOW at V4L the same? Really don't like this aspect of cartos.
Kanger, not Kruger. They are the generic carto that come with most starter kits and are packaged in blister packs of 5. They are the worst cartos I have used. The WOW cartos do run warm. If you take 3 good 5 second hit on a WOW carto without a break it will get pretty warm. They cool down in about 30 seconds though so unless you are chain vaping, they are fine. If you tend to chain vape, I would suggest the V4L CoolCart or Vapornine Turbo. They are pretty much the same thing and run cooler.
3. upStomp- With those 510's I'm assuming I need an adapter? Something that will adapt my KR808D-1 to use a 510 Carto. Is it good for my batteries to run a 510 with them? Is the resistance of the carto different for a 510 vs KR808?
You can use an adapter to use 510 cartos with a KR808 battery but I do not see any advantage to it. The KR8 cartos are pretty much the same except for the threading.
4. Looking at prices for blanks compared to filled (V4L-8.95 blank vs 10.50 filled) is it better to get filled to try the flavors before buying a 30mL bottle and getting blanks?
No. Prefilled cartos taste bad. I have never had a good prefilled carto. However, I have filled a blank carto with the same flavor liquid from the same vendor and it was ok. Blanks + juice = more gooder
5. I tested my batteries and know they are 3.2v but how do I know what the mAH is on them?
Only real way to tell is the size or how they are listed on the vendor site. For the KR8, there are mini/180, standard/280 and XL or mega/380. Some vendors advertise their standard battery as 300 mAh instead of 280 but in general the standard is 280
Thanks again for your response and your time answering my questions.