Has it been considered to perhaps up the respawn time on the small camps and add more gold to them similar to how it was in season 1?
What if we got a bonus bounty for clearing the entire set of minions in a camp? This doesn't deter counterjungling, it would promote it.
The bonus bounty for clearing entire camps could be scaled through the entire game to offset lane gold creep as well, without having to readjust the actual reward for each minion. Now all you have to do is tweak the bounty whenever there's a need to readjust 'farmer' class jungler gold gains.