This is a fair criticism but, you need to show there is a pertinent distinction between God and humans as far as establishing that a distinctive behavior on God's part would still be benevolent.
God has a will and sometimes God wills things to happen. God does not have behavior since God is not a human. Only humans have behavior.
Let me elaborate on why with an example: Imagine that I were to tell you that it is immoral for a woman to rape. Imagine I also proceed to say that since Joe is a man, he is not acting immorally by raping since he is not a woman, and it is a false equivalence to judge Joe by standards that are only applicable to a woman. You could easily reply there is no pertinent distinction in terms of judging the morality of rape between when men do it and when women do it, and that therefore the standards applicable to women are also applicable to men as far as rape goes.
You are comparing humans to humans. Human standards do not apply to God because God is not a human. Again, when you compare humans to God and try to apply the same standards that is the fallacy of false equivalence.
You seem to be saying that it is for our benefit to remember God. But then two questions arise. First, if it were for your benefit to remember me, am I entitled to cause you to suffer just to make you remember me?
First, you are comparing humans to humans. Human standards do not apply to God because God is not a human.
Again, when you compare humans to God and try to apply the same standards that is the fallacy of false equivalence.
Second, God is not 'causing' anyone to suffer, suffering is simply inherent in life in a material world.
Third, God has no needs, only humans have needs, so God does not need to be remembered, we need to remember God.
Second, how is God omnipotent if he needs suffering to make us remember him? If he doesn't need to make use of suffering then he is not omnibenevolent for there would be an alternative that doesn't involve suffering.
God does not need suffering to make us remember Him. Humans need suffering in order to remember God, because otherwise we would just bask in the pleasures of the material world forgetful of God. It is when we need help with our suffering that we will remember that God is the only one who can help.
If God chose suffering to be necessary to attain perfection then God is not omnibenevolent.
Again, that is only a personal opinion yet you state it as if it was a fact.
In my opinion, if God chose suffering to be necessary to attain perfection because God is omniscient, so God knew that was the best way to achieve His purpose for humans.