It's a little strange to ask if you can win with a 2,5x advantage. It looks like all the superiority falls on the allies? And in general, it is not clear what the problem is to beat the Ottomans, how much I played in Italy, I did so much. And with allies and one on one. True, this usually happened later. Usually, if the forces are equal or a little more, then this is enough for a person to defeat the machine.
Version 1.32? Then the AI is a little cowardly, if it feels superior, it will not get involved at all, but will go to besiege Poland. Or Spain. Or even hide.
The easiest way is to drive him into Anatolia, then capture the straits. And since there seems to be an enclave opposite Crete, then he will go there. If it's too fast, land the Marines on the very edge of Egypt, take the province and get out, and keep going like that for as long as you want. AI does not tolerate such impudence at all. Well, then, when everyone pulls up, add pressure.