Found a temporary but working solution. Savefile passed 25mb and level 49 atm.
As you know the crash happens after 18mb. This is how i bypassed it;
Load the save, wait a bit then type "player.kill" and load the save again. You can play it for hours and can save too until it crashes again. Do this everytime after the save starting crash.
Also after 20mb ish you could witness more random annoying crashes, i bypassed this too. When you ever encounter multiple random annoying crash (while saving or else) just start a new game. Wait for all MODS to fully load, then load the save again.
You can continue this until you get bored but i assure you this the only way.
Always use manual new save, do not overwrite ever.