I have some 2 proposals:
First:
Im in postmodern age in diamond league (age rank #2), there are 2 other people in diamond legue. #1 is in crystal.
handsome russ and alphatier, who is a guild member. The only oppenent I get in normal is handsome rus.
I think the selection of opponents in normal should not be <your age, your league> only
instead it should be a group of 10 people. In GBG the battlegrounds are filled up with lower lower guild if there not enough.
Just use the same mechanism.
The same applies to the hard and easy opponents. Right now I have 2 opponents, Valush requires a lenthy manual battle which I try to avoid (sorry handsome russ) and vlip-2 (sorry as well) whom I attack.
Second The rewards:
We get one fight every 2 hours. compard to GBG the random rewards are severly lacking.
In GBG you get 10 FP estimated at 10% chance and and blueprints for the good statue of honor with a higher chance
In the PvP Tower I got some <2 extra attacks> and something else
In GBG you can do a lot more fights than in he PvP Arena, so the rewards should be better than in GBG.
like 10% for 25 FP, 20% blueprint,...
Also there should be special PvP Building a little better than statue of honor, and blueprints given with a random chance each battle.