Tough to give good answer without being there and knowing all variables, but mixing halo- with gly- is fine. One oz/A is plenty with that material. I used to use a bunch of it and only used 2/3 oz when I did with good results. Only reason I switched to a different material is price.
I'll say this, I treat 6-7k acres for nutsedge every year with the top three sulfos for that purpose, and I never seem to see major consistencies from any.
Nutsedge is a plague, no different than bermuda. Treat and Re-treat....over and over and over. Year after year after year.
Should you plant corn again next year, you may want to consider metolachlor(Dual) as part of your pre-emergent app. Can also be found in "Halex".
