presoak next time.
I wouldn't dilute it for my own work.
Presoaking your film does exactly the same as filling up developer with water afterwards. I've heard that C41 dev kits are very robust and would assume that a little dilution is not going to hurt. A guy tried to really hit on C41 developer hard in order to achieve lomo style results, but never got those crazy colors, at least nothing that couldn't be trivially corrected post scanning.
Trying to be the best of whatever I am, even if what I am is no good.