1) Have you tried running just the 3rd miner to make sure 1st run went through fine. If that works it may be a timing glitch with the EveMiner script. The ship may get to the belt and not get the focus it needs to start mining since ice has a longer cycle. Not sure what you can do about that except swap to a Mack
2) Does not look like you can setup for mining drones at this time.
3)
Qty Item Price/Unit SubTotal m3/unit m3/subtotal
1 Clear Icicle 51,000 51,000 1,000
Profit 51,000
Versus
300 Helium Isotopes 255.27 76,581 .15 45
25 Liquid Ozone 280.42 7,010.50 .4 10
50 Heavy Water 17.12 856 .4 20
1 Strontium Clathirates 344.03 344.03 3 3
Profit 84,791.53
Conclusion Ice takes up 1,000 m3 and nets you 51,000 isk per unit, however, the components take up 78m3 and nets you 84,791.53 isk per unit. So you can take 12 times the amount and make a much higher profit.