You should focus on making your broly an lr.
I dont know what the big fuss is about these mono teams, they are good for certain events only. You should be running a team based on link skills for maximum damage.
The team i run is
Phy vegito blue
Ss4 gogeta
Lr ultimate gohan
Ss4 goku
Ss4 vegeta
Str gogeta
Randomly pick a friend
These are mostly randoms and with the exception of vegito blue each of these units hit for just under at or just over a million damage each, and even phy vegito hits for about 300,000 for one super attack not counting his additional attacks. But when i run a mono team, sure ss4 gogeta, goku, vegeta, lr gohan can hit for two million, but too bad the rest of the mono team is nowhere near as good. The best teams to build are teans where all 6 characters can link with each other with at least 2-3 skills each.