Just got my vamo and am loving it. My nova is working well unless I tighten it down snug. When it's completely screwed down, not tight but just snug, the resistance drops from 2.4 ohms to .3 ohms. If I keep it loose it'll read 2.4 ohms and work fine but it kind of flops around. Is this a problem with the vamo or the nova? Has anyone had this problem? Thanks for any help.