Working on a 4* Level 40 horse team. Cecilia, Abel, Cain, and Ursula. I did just pull a 3 star Eliwood. Might pull Jagen, Eliwoods, and Frederick into the fold at some point.
The jump from stratum 7 to stratum 8 in the tower can be really annoying. They are all around level 34 and sometimes its a choice between Level 32 and Level 40.