Sry for the late reply. I don't connect too much on the forum and so can't read msg on my profile.
PM me, if you wanna be sure to have a quick reply.
My opinion is that Maxi is an easy match up for Ivy.
The way I usually play against him:
Your main objective is to keep him away, once there he'll not be able to come close without taking some damage or CF damage.
CL should be your main stance once he's close.
Mix between 9G~B and 214B to stop his pressure game, and mix between 1B B+K and 3A when at advantage.
If you can react to 66A, 4A+B and things like this, it's even better but you can win without that.
Once you started to counter him often with your moves, he'll be force to use his fast string.
Then, just block and put him away. Or back dash very often to avoit most of his fast move.
In case you wanna use SW, maxi can't really punish 2A+K.
3B is also a good way to deal important damage, cause you can hope to hit him in counter during his strings.
And you can probably try to hit him from time to time with 44A in counter hit for massive damage.
WP 3A forced him to use dash gard as his main way to approach, use it a lot. Then 44A+B or 6B+K as a mix up.
Also 9K, 9~GB and 4K works well.
The only thing you should fear are his throw which are good cause they deals good damage and he can start his pressure game.
Is there a vids of your matches ?