if you are usign autobahns you should be fine to encircle bunkers
plus it looked for me we have limited resources and producing inf is not the best option
Maybe you keep spamming cavalry so you do not have enough for infantry. In this gamemode, you never lack resources. Just wait an hour if you are on a deficit. Inf spam is a great counter to any counter in general and gets better with armour car and flamethrowers.