To get the temp down quicker:
Fan across the top of the tank, also fan on sump if you have one
Take whatever ice cubes you have now, place them inside a ziplock bag, then place that bag inside another and put in your tank, in the sump if you have one.
Freeze RO water so that you can just add that directly to your tank and not have to use all your ziplock bags in the future.
88 is a little high