You'll need a second identical hide.
Don't get a tank fogger, it's a waste of money in this case.
Do this instead.
Or, get some sphagnum moss, get it damp and put it in the tank.
Or, run a humidifier in the room.

87% is too high, even during shed. Aim for 60-70%. I know spraying causes the humidity to fluctuate, but the tips I gave should help even it out. If possible, stop using the lamp all together, or put it on a lamp dimmer so it won't dry the air as much.

Also, try to follow the 10-15% of snake's body weight rule for prey items. Get a hold of a kitchen scale that measures in grams to find the appropriate size feeder. Or, find prey that is the size of the width of the snake at its largest point.

You said his eyes are white? They normally turn blue before a shed, then go back to normal right before they start.