[WraithLord]

This extract from the first post is what ppl think reduces MM w/o having serious side effect on balance/fun:
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1. No gem gens.
Note: Efforts are being made at modding for compensating gem gen reliant nations.

2. Determine an upper limit on map sizes, # of players and reasonable victory conditions. Consensus
10-12 players, 10-15 provinces per player, 40% capital VPs victory condition.
Note. MM is in direct relation to how many provinces one controls at end game. Worst case scenario (MM wise) is 2 powers each controlling 30-40% of the map making war.
# of players and victory conditions have similar effect.

3. No Diplomacy. i.e. RAND.
Diplomacy is not directly related to MM but cutting that part of the game results in faster turn processing. Plus, it allows for different patterns of gaining victory (no alliances, NAP turtling, dog piling etc) which could be refreshing on it's own right.
"

I plan to participate in future games that follow these guidelines (1+2 for sure) and so be able to test first hand how they influence endgame MM.
Thanks for all the feedback!