I was facing the same issue with my VTC5s and decided to write to my local reseller where I got my P3 from who then wrote to Provape.
This is what I wrote them..
Hi there. I just purchased a Provari P3 Satin Black 2 weeks ago and I realized something strange..
The battery life is quite bad vaping at 1.8 ohms and 15w. I'm using a brand new Sony VTC5 and it don't last more that 4 hours before the P3 says empty. Funny thing is, when I remove the battery and place it in the charger with volt meter, it says that battery still has 3.8v. It looks like the P3 is cutting off at 3.8v.
I've tried with another VTC5 and a LG all 18650 batteries and same thing, always cuts off at 3.8v. Any advise?
And this was their reply, what you guys think?
[{Moderated} Removed email response. Forum rules: 12. Communications considered private
Posting the content of PMs or personal emails on the forum is not allowed. All PMs and emails are deemed to be confidential and cannot be made public except with the prior written consent of the author.]
You can now use flat tops but it will screw up the system, so stick to AW IMRs? Seriously?
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