Just an idea, never tried this but it should work: put the “collect income” phase form the end to the beginning of the turn. Right now the rule book tells, that you have to collect income at the end of the turn, where you receive money for all countries you just conquered. It’s the widest expansion of your force in a certain round and for that reason associated with a “maximum income”. In the course of the round, when the other parties start their combat moves you probably lose previously conquered terrain and hence IPCs you just have “earned” in your turn of the round. Starting a turn with the collect income phase would let you earn less money a turn in comparison to the collect income phase at the end of the turn. Eventually that’s the logic behind the idea:
rules: collect income at the the end - widest expansion - maximum income - more units could be bought - prolongation of battles -more time invested
idea: collect income at the beginning - smallest expansion - only minimum income -less unit could be bought - shortening of battles due to less resources - less time invested.