It was DESIGNED to be radial. Short range, but radial.
Also the Paragrims and the Overguard caps?
Seriously NOTHING needed to be changed. Aside from the few meta-max players who insist on making nuke frames out of everything, Dante never felt overpowering when I was running with other Tenno who had him and I didn't. NEVER ONCE did I resent the buffs OR the (I'll says it) CROWD CONTROL he was able to do.
Best course of action? MAYBE reduce the damage on Tradgedy by 25% (allowing its radial attack as originally shipped) and revert everything back, Maybe reduced 10% to keepthe ones bleating "OP! OP! OP!" quiet.
These "tweeks" (call 'em what they were; out right NERFS) felt mean spirited and punitive. People paid REAL money to get him day one. Keep THAT in mind going forward DE.
I hope you'll do the right thing and revert him back with SMALL... and we do mean small... changes.
Good luck.
I hope for the best, but I plan for the worst.