Team Gauntlet was adjusted some time ago so that the PvE bases appeared appropriate for the league in which their own team was located. I think changing again on this would not be a bad thing.
In addition, an implementation of the RAID function for the PvE bases would also be worth considering.
As with Temple RAID, the bases could also be set up and scored differently.
Speaking of Temple RAID: In my opinion, a further adjustment would be necessary here, as far as the strength of the PvE bases is concerned, as well as an expansion of the existing levels at the end of a temple.
I mean, Harbinger - seriously? There are seven more evolutionary stages!
If an adjustment is made (based on the levels), an expansion of the rank rewards will probably also be necessary.