i think that boethius solved this problem, and spinoza took it to new heights. here's the thing, imagine you watch, from a distance, a man get up and begin walking on a path, while the sun goes up. you can tell that the sun will rise, this is because of the fixed laws of nature, and can also tell that the man will reach the end of the path. the sun is determinate, the man walking is not. you observing the man doesn't mean you are controlling him, but you can tell where he will end up.
spinoza's twist is that while all humans have this form of 'free will' there is no such thing as evil to god. it is what we term for events, people, objects that we percieve are unagreeable to us. but to god, we are clearly walking on a path, and to him nothing is bad.
so i think that epicurus' problem can be solved by the realization that evil is relative, and to god it is non-existent. it doesn't mean we have less free will, just that from the options presented to us there is none that god would consider as evil (b/c he isn't).
i don't see how the conflict remains. let me know if you do.
I understand your point that God is relative and I appreciate your opinion on this.
As I have pointed out in another thread, the notion that God is the ultimate creator and starting point of all then we have to consider where evil came into the picture which is what the riddle tries to consider. This is of course relative, but relative to common understandings about God in which claim God is the ultimate creator. The explanations relative to this ideal claim that God has nothing to do with evil at all and that cannot be. For us to even have the capacity for evil or to deviate from good (which is still "evil"), God had to give consent for it. We cannot claim that God doesn't want evil then turn around and claim that God has nothing to do with evil at all. God had to at some point allow for us to deviate from good which God does with freewill. At this moment, evil was born. It would be impossible for evil to be unless God gave us the capacity to deviate from good. Allowing this capacity to deviate from good IS evil. To claim otherwise is just a continuation of the riddle which refutes itself.
To simplify my thought and perspective:
God is the ultimate origin of everything.
God can only create good.
Therefore God cannot create evil.
This is clearly a fallacy. If God can only create what is good, then evil should never be. For God to create the capacity to deviate from good is not GOOD. This is evil. People commonly disagree and start claiming "freewill," but freewill in itself allows for the capacity to deviate from what is good. This is evil. If God created freewill, then God created evil because freewill is the capacity to deviate from good which is evil in itself.
"... proudly defiant of the irresistible forces that tolerate, for a moment, his knowledge and his condemnation, to sustain alone, a weary but unyielding Atlas, the world that his own ideals have fashioned despite the trampling march of unconscious power. " Bertrand Russell