you are looking at the wrong key mate

in this key he starts off at rel+ and goes to 1.68c with cluster, also dealing with bombs and explosions is gonna be pretty easy for garf because
whoops, thought this was Dark Hero Arc
ok that changes things
Bakugo still outpaces him by a good chunk and Garfiel has zero range options but now Bakugo isn't landing thousands of blows before Garfiel has a chance to heal, so the healing is going to be more relevant
However, this does allow Bakugo enough advantages to toss out cluster boosted Howitzers without much effort, especially with Stun Grenade helping him and the scale of his attacks being much larger than anything he can reasonably dodge (I assume the Cloud Dragon's projectiles were either smaller or Garfiel was just eating them cuz he's being nuked from the sky). Garfiel isn't durable enough to properly heal from or handle Howitzers, since again they one shot people normally on Bakugo's level to such an extent that Shigaraki, a character who's 1.12 Petatons and had up to that point been facetanking everything including Suneater and Nejire's Blasma Cannon, saw Howitzer as enough of a threat that he had to "get rid of it" before Bakugo landed it, even calling it "fantastic". Gonna be honest I still don't know why Bakugo's Howitzer Impact isn't considered 6A just because we didn't actually see what it could have done. Regardless, Garfiel isn't taking that amount of damage without severe consequences, and even if he doesn't get 1 shot off the bat (which honestly he might) Bakugo can just do it again and then there's nothing Garfiel can do.
Heck, I think all of us are forgetting that Bakugo's
BASE EXPLOSIONS are already scaled to 18.65 Teratons, while Cluster gives him an amp higher than Howitzer already does. Considering how Bakugo's Howitzer makes him strong enough to 1 shot people on his level and Cluster is STRONGER THAN THAT and both can be STACKED, I don't see Garfiel just taking it and using AD to grow past it, especially since Bakugo has a x2 speed advantage
1. He would just heal, adapt and get stronger/more durable till the explosions stop doing anything to him
2. he scales above Elsa who dodged a room blowing up without exiting it....which is physically impossible and definitely superior to being carpet bombed
1. except Cluster is already insane enough to maul Garfiel on contact if not 1 shot him off rip. Low-Mid isn't good enough to recover from stuff like that, even though it is very potent for his normal explosions
2. Either the explosion is smaller than the room or there's something fishy going on there. Can you post a scan of where this happens?