yeah, ping is ~350ms on my end as well, from Globe (office) to my CGNAT'ed Fibr
zerotier-one is a bit better, at ~150ms (same box)
my previous setup is my Home Fibr is configured as openvpn-server, and IIRC it's less than 50ms (same box)
I have a reverse vpn (office-PLDT has an openvpn server, and my CGNAT'ed Fiber is connected), and it's less than 10ms
was actually thinking of getting those BuyVM box -- only ~$40 per year, with 5TB of monthly bandwidth and install openvpn to connect all my devices (including cellphones), but so far zerotier-one is quite OK (even on android)