Why do you make it sound like Luffy's Haki gets stronger from base to gears. It's the same Haki.
KATAKURI made LUFFY scream in pain even though he was using SNAKE-Man, in a collision.
Base Luffy with his strength, already caused and took a lot of blood from doflamingo, even he protecting himself with Haki.
Greater strength in G4 or Snack > Greater damage.
Doflamingo was being pressured by the forces of luffy's kicks in his base form, which demonstrates that physically in base form luffy is superior in strength.
Again, luffy manages to damage the doflamingo with his bad COA, and with his physical strength at BASE.
"Why do you treat luffy's COA as if it were superior to other forms", its attack potential and damage in other forms are superior, thanks to its physical strength, so its COA is more effective with more strength in its blows, so luffy using COA in base form < Luffy using COA in other forms with more physical strength, damage potential is higher.
Reminding you that luffy's COA also evolves
during the extreme battle against katakuri...
Soon:
DR COA < WCI COA < ABYSS < POST UDON COA.
And here comes the question about the physical strength of the doflamingo, he wasn't able to make Luffy, even in his basic form and physically weaker, scream in pain...
Katakuri did this all the time even in snake man, KAIDO made luffy in the same situation as the flamingo above, vibrate and scream in pain, a luffy who improved his COA in WCI after an extreme fight with KATA, and after training COA in UDON and go to the maximum level.
KAIDO did this with a simple/casual hit.
While DOFFY uses named coup.
After the doflamingo's DF-driven kick and named blow, luffy didn't scream and was completely fine, different from the two situations above.
Kick after kick and several minutes passed by Luffy Base VS DOFLAMINGO, and doflamingo had no Ap power to knock out BASE LUFFY.
They were exactly the same (Equal).
G3 luffy has more AP than DOFFY, but Doffy was faster and dodged, as G3 is slow.
You should be ashamed, the man didn't have AP to knock out Luffy.
Doflamingo had to go to an awakening and use his biggest attack to try to knock out Luffy's base.
Resist Luffy after defeating two YCS >>>>>>>>>>> DR LUFFY.
Resist luffy after UDON >>>> DR LUFFY.
CoO Luffy > CoO DR luffy.
Current Luffy ACOA > luffy DR COA, basic COA.
Physical strength of current luffy > Physical strength of Luffy in DR. (Luffy did physical training in UDON).
Combat skills and intelligence (experience after defeating two YCS) > Dr Luffy. And that's the treat that a Base luffy infinitely superior to his version of DR luffy who was equaled with Doflamingo gets:
Remembering that Luffy is infinitely stronger in his basic form compared to his DR version which even with basic CoO and basic COA was facing Doflamingo as an equal.
Luffy base current low difference in Doflamingo.
Current luffy G4 kills Doflamingo with 1 punch with ACOA.
He is fodder.
It didn't take a lot of hits to defeat doflamingo in G4 with basic COA and a physically weaker luffy.
Even if hell freezes over, Doflamingo will never be a top tier. Low, mid, high, never.