Yes, we are using VTI's for VPN tunnels and VLAN interfaces for Direct Connect. Both with /29's so we can get all three IP addresses setup. Traffic flow is fine and we just have that hiccup during failovers. Traffic flow does resume.
Also, the configuration download AWS offers does not seem to mention graceful restart. Just DPD and MSS as recommendations. I do see the AWS configuration download option now offers R80.10+ (in addition to the original R77.10+ option), but still no graceful restart mentioned.
We just wanted to avoid a change window if we know if will cause other issues by enabling. Thanks.