I quoted 1 Peter 1:1-2 and not 2 Peter 3:9. 1 Peter 1:1-2 is saying that God elects according to His foreknowledge. 2 Peter 3:9 says that God is not willing that any should perish but that all should come to repentance. But yes. I agree with you that 2 Peter 3:9 is not compatible with Calvinism.
I know this goes outside the realm of your personal experience, but Wikipedia states,
"Molinists have internal disagreements about the extent to which they agree with Calvinism, some holding to unconditional election, others holding to conditional election and others still holding to an election that is partly both."
Source:
Molinism - Wikipedia
This is why I prefer not to carry the Molinist label because one can be either a Calvinist type Molinist, or a Conditional type Molinist. It is the same reason why I prefer to not identify with being a Protestant. For Martin Luther is the founder of the Protestant reformation and I do not agree with his many statements that suggest that we can sin and still be saved. For he said we can sin a thousand times a day and still be saved. While Jacob Arminius is associated with Protestantism, he did not appear to justify sin like Luther did. So I prefer to say that I am an Independent Free Will Libertarian.
In Calvinistic Molinism, they most likely believe GOD elects or chooses a world where some will not be saved in another alternative world. This is a violation of basic morality because this means God does not care to save all people, and He lets them to be the unlucky ones. It would be like a coast guard saving everyone within a group you were with that was lost at sea, but the coast randomly chose to not save you and your family for no good reason. In such a scenario, you would think the coast guard was not being fair (Especially if he has the ability to easily save you).