Rewards based on rank won’t work until they fix mission or remove rank association with running FW missions, as you can easily become a General within a day of grinding lvl 4’s.
Changing defensive plexing is still the best way to go, imo. Pilots can farm oplex, but clearing rats will always call for high dps fits that would require damage mods in place of warp core stabs.
I suggested once that maybe the structure could be destructible and you can build defensive plexing around this. All around, defensive plexing is very lame and boring for anyone to do. It encourages AFK play by its very nature, even more than mining does, as you are required to do absolutely nothing but sit there within 30km of the button.
Another idea would be to create some kind of high bounty enemy npc rat, similar to Clone soldier rats, who’s worth is determined by the upgrade level of that system, which could help bring contestation levels down.
I am not a fan of PvE solutions. I’d prefer a phase which the iHub could enter that drops 20% off the contested level of the system, but if it is attacked during this phase, the opposite occurs and 20% is added to contested level. An new option added in the hub’s donation UI. The amount of LP required should be the total amount of LP of every offensive plex combined at the current level of your tier. The time it takes to begin and remain targetable I will leave open to debate, but it should send out some kind of visible notification to anyone undocked within FW space, imo.