My last game, a 1v1 on Lost Glider...
There's the problem, you don't have Lost Glider vetoed.
Jokes aside, Ass Engies deal nicely with them, I saw ass grens in cover lose to advancing ass engies (up to close range) on Vons stream. But they probably do better without flamers against them rather than with the flamer. Riflemen can also win when you spot the grens at max range (even if they sprint up to you), it's mostly left to RNG to decide, light vehicles tend to bully them a lot too, so, if you like going captain, consider the AAHT (M20 is a love though, seriously, use it. And plant mines whenever possible.)