Revenging a lower rated opponent
You answered your own question the trophies were +18 / -48 for you and +48 / -18 for your opponent.
If you want more than +18 trophies, pick an enemy with a higher rating.
Unless you have a PhD in statistical analysis, I am not being sarcastic, you are unlikely to improve Elo’s math.
Raid rewards are a whole different discussion and the balance between fun, grinding, F2P, P2P, etc. is an interesting one.
Trophy distribution at each tier of team power
What was interesting about the data collection was not Defense power to trophy ratio - that is flawed from the beginning because this is an MMO - but the statistical distribution of trophies for each tier of team power. An interesting analysis of opponent pool, tanking, raid rewards and Wanted mission hero chest reset timer.