I’ve added several issues to the OP. Hopefully the big/obvious issues will be patched soon, as they are really skewing some people’s opinion of the patch/balance.
See Issue #1, 2, 3, 4, and 12. If the balance feels bad right now, its often due to a combination of issues in the OP. Hang on for the next patch!
@MaxL_1023 these quotes are all yours:
Re hw1 frig vs destroyers: see #6
"HW1 DDs seem to be stronger than HW2 - not sure if it is just bias but frontal ions seem to be more effective than broadside guns/missiles. They are less vulnerable to DFFs and Def. Fighters as well. "
->1 Hiig DD vs 1 hw1 DD = draw
Regarding other differences, game is meant to be asymmetrical
“Resource controllers seem to be terrible at docking collectors - I need about 1 for every 3 collectors it seems, while refineries are good for 8.”
->Please retest. hw1 resource controllers were largely redone in 2.0, to allow them to support up to 8 hw1 collectors harvesting an asteroid patch. They should be roughly equal to a hw2 refinery now.
“It is also possible that Hig DDs might be fighting without the torpedo upgrade for awhile due to resource constraints.”
The Hiig torpedo upgrade does not help hiig DD’s, its an old myth (and maybe a typo?).
“One more thing - torpedoes self-destruct when the target is destroyed instead of re-targeting. Is this intended?”
Usually missiles/torpedos blow up if their target dies before making it half way to the target. They also have a limited life span.
“Besides this, everything seems improved balance wise.”
Awesume!
See #13 for a buff. Kadeshi is spot on that 20 defenders will always beat 20 of any other fighter however (both aggressive).
Actually, I really have to question your testing methodology. 
–>20 Kus Defenders vs 28 Vaygr Assault Craft(aggresive) = 15+ defenders, quicker battle (5 tests)
–>20 Kus Defenders vs 28 Vaygr Assault Craft(evasive) = 15+ defenders, longer battle (5 tests)
Defense fighters have the same top speed as interceptors now. See the 2.1 balance changes at the bottom of the 2.0 Balance Changes thread. In 2.0 they were only about 15% slower than ints though.
Edit: I may have found a decent way to micro defense fighters:
20 Kus Defenders (wall of 20) + 10 Taiidan defense fighters vs 30 Kus Defenders (2 walls of 15) = 9 Kus Defender + 10 Taiidan defense fighters
I set the defense fighters to passive, and used them like a shield to block incoming bullets. Micro intensive, but it worked. It can however be partially countered if the enemy moves inside the fields. Video