1) Vamo Head IS just press fit. Press fit may mean more of a challenge than you are prepared to deal with.
2) No way of knowing if you have kept it in good condition or knocked it over a dozen times. I've dumped mine a few times.
Yes, it sounds like your board is out of line.
When considering price Nothing comes close to Vamo's capabilities and when properly cared for they do last. there are sever threads on correction minor issued that may develop from improper care/use.
Moving on, sigelei z-max is next in line.
My, now 22 month old Vamo v1 still works great.
Well I don't know what you consider improper care or normal wear and tear but I will say that it has rolled off my desk on to the carpeted floor twice with no effects. The button sticking happened when I was driving after checked the resistance on my atomizer before beginning my trip. The next button press was the fire button and I got the burnt taste and didn't know why. I primed the head a bit and tried again and that's when I noticed my wattage was turned up to 12.5 and with every little tap on the body it would go up even more. Other than the two drops from my desk which is about 3 ft onto a padded carpeted floor with no apparent effects, I don't see how a button press could mess it up unless the drops caused the board to shake loose a little and the button press a few days later was the final straw. I don't get it but whatever. I'm glad yours lasted but mine sure didn't, proper care or not.