AOC and EC, from the first post:
"The goal of the list development is to represent the capabilities, structure, and units of the Adeptus Mechanicus Skitarii Legions in a way that is accurate to the fluff and available stats of known units. "
"This translates into better than average infantry formations with multiple ordinatii supported by Sagitarii, Robots, and Titans. "
The skitarii seem to have much more in common with the Ultramar PDF but to eliminate the pedantry surrounding the term "PDF" I changed the name of the core list to "Skitarii Legions". The list represents the skitarii in a "pure" form as they would operate on a forgeworld or as they would exist on deployment off world. In either case they would have titan support available. It does not represent a planetary militia called up for defense, the full legio cybernetica, a cataphractii legion, or ordo reductor. These are the professional armed forces of the AdMech as you would see them fighting and forms the core selections from which a legio cybernetica, Cataphractii regiment, or ordo reductor list might branch out from.
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Also I think making the Robot formations either 3 or 5. 4 just doesn't sit right.
Sit right or not, that's what the fluff specifically lists asthe size of a typical maniple. You need a far more persuasive argument than "sits right" to make a case for different number on the robot maniples.

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Add a Magos to the Sagartii Formation making 1, 4 and 0 or 5 Gun servitors would be nice.
I'm not really sure what you are saying here. Are you saying remove the magos (tech-lord) upgrade and incorporate it into the sagitarii al la the IG regimental HQ formation and give the option to take 0,1,4, or 5 servitors?
I think we could work with 0 or 5 being the numbers of gun servitors taken, especially if the formation is limited to 0-1 with the magos included. I'm leery of seeing the sagitarii as a core formation with only 5 stands of fairly cheap infantry due to the popcorn effect. If we went that route I'd rather see the praetorians take the core slot with the sagitarii in support.
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And I'm not even a fan of that!!! Why not make an AA Ordinatii Platform instead of just tacking on AA to the HB.
Mainly because we don't really have an official weapon that is titan grade and AA capable outside of perhaps the defense laser and I'm not sure how many defense laser minorus companies we want running around

I'd like to see the removal of imperial navy units entirely from the list with most AA being ground based. At this point it basically means you need to take a battle titan with CML, an Ordinatus, or take the flak upgrade for a core formation. I think this makes an infantry heavy list very difficult to use especially as my last game showed, so we have a couple of options.
First would be to put back the AA shot on praetorians which would work alright. The second is to create the AA gun servitor which people don't seem to like the concept of.