Funny, I thought it was just me that got tired of trying to get an A2 Hosted VPS server to work. I gave up after about 2 weeks and moved to InterServer for the same reasons that you chose Vultr.
The only thing I can say is when shopping for a VPS host, make sure you get the KVM type of VPS server because the other types do NOT have swapfile space and do not allow you to allocate it yourself either.
The KVM type of VPS server typically also will cost a little more than the standard linux server, but without swap space you will be fighting an uphill battle.
Also, consider the linux OS when you are trying to decide on a permanent production server. Some recent events have illuminated some short-comings of Ubuntu 16.04 and older. Please refer to this post for a more details, but it comes down to how much time you want to put into manually scheduled maintenance for the OS…
Ubuntu is great at some things, but needs improvement in how it handles it’s own updates.
Hope this is helpful to someone…
BKM