I found this article to be very informative. http://msue.anr.msu.edu/news/how_to_choose_and_when_to_apply_grub_control_products_for_your_lawn

i think its late to seed in north jersey, probably getting freezing temps this week or next?

That is a good article newto. Looks like the OP used the wrong product to kill grubs. So he/she should not reapply the wrong one but instead use the right one.

Now here's the thing about using insecticides over and over or using them as a prevention against a pest that you don't have yet: one of the major classes of beneficial soil microbes is micro arthropods (insects). When you apply something that kills insects, it kills these invisible insects, too. They're taken out of the ecosystem. Imagine the effect of wiping out all the fish from our ecosystem. Your lawn is a tiny portion of the Earth, so recovery is fairly simple, but be on the watch for signs of stress lingering for months after applying an insecticide. The solution to restore the soil biology is to apply a light dusting of compost followed by organic fertilizer.

Apply dylox now them merit a week later. Next March apply more merit and again in May. Problem solved.

One problem solved and a different problem created. If you do what darktower suggests, then follow up with organic fertilizer (10 to 15 pounds per 1,000 square feet) and optional compost (rate of 0.5 cubic yards per 1,000 square feet ) at 3-4 weeks after the May app of Merit. That will reestablish the soil microbes and you should have no soil biology issues.