But glass full is at 140% not 100%!
Organization is multiplied by officer ratio up to 140%, higher ratio makes reserves fill faster and it also cuts combat delay significantly (-24h at 140% if I recall correctly). Just for the sake of certainty I started a brand new game as Portugal and invested 100% in leadership from day one. Org of my INFs rose from 7.sth at 80% ratio, through 8.11 at 100% to 12.25 at 140% officer ratio. 2nd draft policy upped org to 16.66. 3 year draft put it at 36.75. Training 3x INF dropped ratio to 111% and max org of other INFs to 29.242. Investing again into officers brought ratio back to 140% - and organisation to 36.75. Raising above 140% put extra officers in reserve but had no effect on my org.
If you don't believe me, you should talk to devs to confirm all effects of 140% officer ratio (or just experiment yourself) and for god's sake PLEASE, don't cripple AI by forcing it to stay at 100%. For one thing, human player can use overrun exploit to a huge degree thanks to their 140% ratios while AI can't do it at 100% having higher combat delay.
Edit: I just realized how much easier this game was because you didn't know of that mechanic - and how lucky everyone is that the OP posted this thread for us both to bump into each other and talk about it here.

Can't wait for AI at 140% officers.