Further thoughts:

So, you’re currently exploring having Movie 1 play out as Mando episodes 1,2,6,3. That’s a lovely arc centered on the theme of who Mando is and where his loyalties lie. He’s sent out to find the Child, returns it with hesitation, takes another job that’s morally dubious and really tests his loyalty to bounty hunting, then when he goes to turn that in, his flashback to his own vulnerable youth causes him to rescue the child, forsaking the bounty hunters, but ultimately proves that Mandalorians are his people. He’s now committed to the child.

For movie 2, we’ve got a theme of two ex-Mandalorians/ex-Bounty Hunters trying to find their homes after changes, and almost bumping into each other. We begin with Boba’s flashback to tolerance from the Tuskens, then intercut with Mando finding peace on the wetlands planet. I’d play down some of the Boba flashbacks now, and play up the wetlands - probably including the fight there in this context (where it’s not a bridge between Mando’s next job). Mando is forced to move on, as is Boba, and they nearly meet. But then the following content feels a little too focused on Boba once Mando’s out of the picture, and I felt like the conclusion (Boba and the sarlacc pit) wasn’t super punchy.

BUT, IDEA: What if we keep Mando on Tattoine, using content from episode 9, where he’s looking for other Mandos. That way, Boba’s getting set up with Fennec, getting his ship back, wondering about his armour, while Mando remains in play, meeting Cobb Vanth, looking for other Mandos, fighting a Krayt dragon, and FINDING BOBA’S ARMOUR. That way, the episode can end on Boba spotting Mando, finally setting them on a collision course. With this, you’d need to remove the ‘looking for Mandos to find a Jedi’ plot, but he’s seeking them sensibly enough anyway at this point. Then your third movie can focus on bringing the Imperials back into the conflict, skipping Tattooine.

I’d perhaps structure that as follows:

Open on Boba flashback, hand raises through sand, armour stolen, taken in by Tuskens, hunting for water pods, fighting off sand beast, earning respect in the tribe. Cut gaffi training scene. 20 mins elapsed. Cut to-
FIVE YEARS LATER -
Mando arrives on Sorgan. Meets Cara Dune. Finds lodging with Omera. Peace.
Tuskens have taken Boba to scout Pyke train. Boba gets bikes from Tosche station, they raid the train. Boba is induced and given Tusken robes. (Issue: He was wearing shitty rags for five years? Or maybe we just don’t acknowledge the five year cut, and just intercut these without implying they’re at the same time?) This content might need a trim for pacing as it’s another 20 mins - maybe we skip Tosche station?
Mando spots raider tracks, trains the people of Sorgan, they defend their new home.
Boba threatens the Pykes.
Sorgan defense wrap-up and peace.
Boba returns to his home to find it burned.
Mando finds that he’s still being tracked, realises he has to leave. [Having seen Boba’s people killed, we feel the potential cost if he were to stay.
Boba wanders the desert.
Mando’s over Tattooine, looking for his people. Meets Pelli Motto. Dialogue suggests “I’m here to find Mandalorians, BUT FIRST I need a job to pay for ship repairs.” Mando episode 5 plays out.
Boba discovers Fennec.
Mando returns to Pelli, and kicks off Mando episode 9, chasing rumours of Mandalorians.
Intercut with Boba and Fennec recovering Boba’s ship, and maybe include the Sarlacc stuff (though it’s a bit weird).
Cobb Vanth fills in the details on Boba’s armour’s backstory, gives it to Mando. But Cobb was a false lead, and Mando’s still being pursued.
Endings: Boba watches Mando, setting up their conflict. Mando, in space, gets the opportunity from Greef to stop getting pursued. And finally, at night, Boba tells Fennec this episode’s mission statement: “You can’t get far without a tribe.”

Then, just to balance your movie #3, you could potentially replace the removed Ep9 content with Ep12 The Siege from your movie #4, now that Nevarro is liberated? Though that might require the implied timeskip to be preserved.

Just trying to preserve as much as possible whilst maximising the thematic links and finding traditional movie arc structures…