If you would play on a different map than "Only Astro Crater Battles RICH 4x4" than things would be a lot different. It is a heavy turtle map without many tactics and gameplay elements you would have in a "normal" map. (Examples: Raiding, drops, TML, etc)
I can understand your thoughts about that topic when I have your favorite map in mind.
But I can not understand the most other assumptions you make without seeing a replay ID.
Like "Flak can easily rip apart every air unit" or "You also cannot easily get in my land when a few pd simply block specific entrances." -> You mean the ONLY little gap entrance you have on your only played map?
Could you help me understand your balance thoughts with some replay IDs which demonstrate the problem?