You have to offer shares out in order to get the ownership of the largest owner below 25%. Investment funds can never be majority shareholders so if they buy shares then it is fine all the way up to 40%. So selling more past 25% can be dangerous, if too many shares are available on the market then they can steal the corp away from you. But since the corp won't be profitable with super high salaries you can make some money off of them before their market value drops (<-Useless number). But you do that at your own risk if you lose control then you will have to nationalize the corp to get it back and it comes with a fee. The higher the MV the higher the fee. Of course you don't have to do anything of this. <- this is all an edit so below gives an alternative of ignoring truly public or using your CEO. It's just my prefered method.
Only boost country controlled corporations to high levels, but you are going to have to watch them, you still want them to break even. If you go too high that won't work.
This strategy is a little complicated but you have an enterprise which means you are probably a premium member meaning you can get more countries. So what you could do, is have 2 investment funds from 2 other countries buy 40% of each corp a piece. Have the country hold 20% once the countries ownership hits 24.99% (or less) it can be upgraded to 250 (instead of 200 for state, or 225 for enterprise) for quality and efficiency. Then you can raise salaries to super high levels. But I'd start slowly if they are truly public make sure they are still making money at 900, 1000, 1050, 1100 etc. If they are losing money it probably won't help that much. Since you don't have 3 countries atm you can't exactly do this, I recommend getting 3 countries so you can do this. But since you are a single country atm, start even lower around 400, then 450, etc. You should be fine upto 700 or so but that's plenty to give you good incomes, and indexes.
So you have some of your own ceo corps, but mostly LULI. LULI is a big enterprise and it's paying 305. This is high enough so the LULI enterprise is helping your country. If you fall into employment problems in the future you are going to want your salaries above this marker, say 310 or so. If you are using your CEO the high salaries don't work very good, they will start losing money a lot faster. Country resource payments are based on your revenue and increased salaries>>increase corporate welfare>>increase production>>Increase revenue>>higher costs! So when pricing your CEO corps you are going to want to make it both profitable for your country and enterprise. I recommend 375-475 for this. However if you are not making a profit lower it still.
So state corps around 300. your CEO 310/375-475, your country controlled publics 700ish. Your truly public country controlled 1100ish. But with an enterprise you might just want your enterprise to buy out all your corps. Its a strategy most prefer, but enterprises suck and I've been working on even getting my own CEO corps out of my countries. Its really up to you though lots of things work. You can also have your country hold 24.99 your ceo hold 24.98 a second country hold 40 then you only need to sell 10% to random investment funds then there is no fear of a hostile takeover. Another suggestion. Anyone good luck. And it's a pleasure to help, I am looking forward to more competition on golden rainbow

I hope I'm clear. You do have a couple changes to make.