I like them both, and I can see them each as starship classes.
I could see your larger Apex
as the "real" Scout/Destroyer class Federation starships; like FJ's Saladin
. Maybe this one could even use the same nacelles as the Enterprise
, or a somewhat scaled down version of the same technology.
Your smaller Apex
could be much smaller class of vessel, like the SS Beagle
or perhaps the remastered Aurora
There is a way to make the aft section flow in the spheroid nose: As I suggested in my earlier (May 22) posting, the dome-like structure on the topside of the sphere, on which the bridge sits, could be stretched upward, so that the aft hull would blend into this sub-dome, and then the bridge would sit on top of that. This would blend the top of the sphere with the aft hull.