@Bodeacious:
30% of a Powers total IPC buys 1 roll for random tech (max 1 per turn). I might give that a go. Advantages small countries that may not be able to take advantage of the tech, and stops large powers from going crazy. No diminishing returns. Maybe yanks can’t purchase until at war.
All powers can buy research from round 1.
I agree, the rule is good because if you use tokens the USA should have every single tech in the game by round 20, and if they’re a little lucky could have all the ones they want by round 10.