I have a Flex and had a Freestyle before it. My first suggestion is to put the infant seat, baseless, in the second center, booster second passenger, younger FF second driver, older RF third driver, older FF third passenger.
Second suggestion is RF Radian second center, FF second driver, booster second passenger, infant seat third driver, and FF third passenger.
Third suggestion is swap the booster & infant seat in the second suggestion & do a baseless install.
Forth suggestion is to look for an infant seat with a very narrow base and try it in the first setup.
I hope one of those works for you & congrats on the new addition!
Second suggestion is RF Radian second center, FF second driver, booster second passenger, infant seat third driver, and FF third passenger.
Third suggestion is swap the booster & infant seat in the second suggestion & do a baseless install.
Forth suggestion is to look for an infant seat with a very narrow base and try it in the first setup.
I hope one of those works for you & congrats on the new addition!