You need to be very, VERY aware of something: You say you "can't have 50/50 right now" but do you understand that you're setting the pattern for the future here? Courts LOVE to defer to status quo, and by allowing yourself to be a weekend father, you've established what "normal" is. Changing "normal" (ESPECIALLY for a man, even though it's not supposed to matter) is an uphill climb.
Also, once your divorce is final (at least in my state) changing custody arrangement requires a "material change" in circumstances that will improve things for the children.
When you've been reduced to every (or every other!) weekend, are you going to be able to get a court to take you (a man) seriously when you say "I know this is how the kids have been living, and they're used to it, and it's stable, but I want to change it now?"