Perhaps WLP002? If so, the times that I have used it I found that it flocculated pretty quickly. I don't normally do a diacetyl rest, but that would involve raising the temp a bit to entice the yeast to clean up the diacetyl. If they are out of suspension that is not going to happen. My best advice at this time is:
1.) Go ahead and dry hop at your fermentation temp.
2.) Next time see if you can use the swamp cooler method to get fermentation temp in the range recommended for the strain you are using (you may be right on now depending on what you used).
3.) Keep good notes on the recipe, your technique and procedures, and the outcome. It will help you tons in the future when you want to make corrections.
4.) Let us know how it turned out