Yep, credit wise HB is Mecca, we all should play there.
If you play HB with a Premium plane on Premium account and you shot down one-two planes and some ground targets you should make a lot of credits.
I'm fine even on standard account. I have a simple strategy to play HB on standard account: I'm playing with all planes from all nations until I broke every plane. Usually it takes me at least 5 hours to do that lol.
Then I let them to autorepair in garage until next day. Rinse and repeat.
This way I have a lot of fun (playing with all kind of planes is fun for me) and at the end of the day I have a positive balance too (not too much because is standard account and I'm not a good pilot but is positive at least).
The only problem (for me) with HB is that sometimes MM is funny. I've had games with 5 humans and 4 bots, I've had games with Dora spam when I'm in my Spit II, I've had games when half of team quit in the beginning but also I've had games well balanced and with team full of humans. Also sometimes I'm waiting 5 minutes or so to enter a battle but I'm surfing the net meantime.
I'm playing Tier 6-9 (with some exceptions at Tier 10/11) and bottom line HB is the perfect place for me now.
This is how I play WT for two weeks or so and I'm happy. I don't have anything to grind and I'm just enjoying the game.