Hi Keith,
Just a casual observation, but are you perhaps looking at older manuals on satellite setups? (Or are you maybe modelling an EME setup?) Have you looked at what people are running these days? I say that because as someone with years of experience at successfully working sats, your antenna plans sound like serious overkill for present day birds. They are all LEOs at the moment and rarely, if ever need as much antenna gain as you are proposing. (Unlike some years ago when they WERE needed for HEO birds.) I managed to work all 488 CONUS grids and never had more than 7 elements on VHF and 11 on UHF. And even that was a bit of overkill. Most guys working the birds are using less than that. (hand held antennas/radios with 3/7 V/U elements) The most popularly recommended set of base antennas these days is the M2 Leopack.
https://www.amsat.org/product/m2-leo-pack-antenna-system/ This antenna setup is CP with basically 4 elements on VHF (total of 8, 4 horizontal and 4 vertical) and 8 elements on UHF (total 16, 8/8).
The reason I say all this, is to answer your question... the more gain the antenna has, the more narrow the bandwidth lobe of the antenna has and the more accurate the aiming needs to be. Typically, a Leopack antenna mounted on a Yaesu G5400/5500 rotator setup is the cat's meow. More than that sounds like overkill to me. (What you are proposing is, again, more inline with an EME station.)
And please... I am not sure what 'LDMOS transmit amps' are, but I HIGHLY doubt you need ANY transmit amp AND it would most likely cause serious QRM. The birds today have more of a problem with people running TOO MUCH power and causing swamping of the satellite's AGC circuit, thereby pushing other ops below the threshold of access. Simply put, too much power kicks everyone else off the bird. As a lot of ops are running a mere 5 watts with modest gain antennas.
The issue is more about reception of the bird, not the bird hearing you... low loss feedline and often a UHF preamp located at the antenna is sufficient to overcome that. More than 25 watts is RARELY needed, and again will QRM everyone else on the bird as you capture the AGC and take over the entire passband.
I see you are a licensed radio tech. (I got my license GROL, but never really used it beyond a few 2 way jobs and assisting with some broadcast stuff.) I hope you take all this in the spirit it is offered. I completely understand the confusion as the 'landscape' of satellites has changed tremendously over the years. I was first on sats back on the late 90s, I only worked RS-12/13, an HF up/down bird, as I didn't have the setup to work anything else. Then when I came back around in 2013 and worked an FM LEO bird for the first time, I was like, 'Whoa! This is completely different!!' So I hope if nothing else, I've re-directed you to an easier and more productive setup.
Please ask any more questions... and if you need a reading reference, try one of these:
digital:
https://www.amsat.org/product/2020-edition-of-getting-started-with-amateur-satellites-digital-download/paper:
https://www.amsat.org/product/2020-edition-of-getting-started-with-amateur-satellites-print-edition/You may just see a picture of some guy with the aforementioned handheld radios & antenna operating from Roswell and making reference to a 'UFO' as he talks.

(page Funcube 4-2, picture of me roving in Roswell, NM)
73 & take care! Kevin N4UFO