3 attys seem reasonable for 3 weeks of 6v use.
Some attys by the same manufacturer seem to be made better than another, Dont know why this is but it seems that way,
I blew quite a few too. I have tried the HV attys and they seem to last longer. I have not blown one yet. Still assessing whether I like them or not.
I went almost completely to cartomizers as they hold up under HV and are cheap..
PS> I had the most trouble using 801s at 6v. 510's seemed to last me longer.