I had the same problem with the UK. It has a simple solution, on H/H unleast. First allways garnison ALL your ports. Second keep watcing for the enemy. And at last upgrade all your southern towns (routes and barakas). When the enemy comes you will have one turn before he desembarks and one after that. All you need is a garnison of 4-5 bargir musketmen and a general. When the cursed anglos come you can build 8-12 units in a single turn. This is more than enough to kill the invaders. Then send the army to kill some mogols. Afcourse you will to blitz from the start in order to have the cash, but this is the way allmost everyone plays.
Now, if you are realy good wiht the navy you could try to kill them in the water. But the money you will need to build and mayntain this navy so early in the game is well to much. The army recruit could be used against the mogols. But on the ather hand you will need to build a large navy later on any whay.