Read crop oil label. Some crop oil labels or types are "hotter" than others. Or basically consider it more concentrated. So, just read the label off the jug u buy. Some, you'll match the amount of clethodim you put in or even more (say a quart) and others you may back off. Clethodim amounts, above will do you. 16% be fine. I go up to 20% sometimes. Water volume is also something else to consider- with clethodim & crop oil, I prefer to put on higher water volumes to saturate grass. For example, if I could put down the same amount of herbicide with 20 gallons or 40 gallons, I'd choose 40 gallons. Just an FYI. Don't mow grass right now either that you're gonna spray in your clover. (I doubt anyone would anyways).
Looks good TH, give it a few more weeks and that's gonna be tremendous.