Hello and welcome to the forum dulltongue. Glad to have you here!
Have not tried the Silo tank but do have a Nautilus with the bottom vertical coils. The Silo tank is very similar to the Nautilus from what I have read.
I run mine at the highest wattage the iStick will allow. Right now it is at 15.1 watts using a 2.0 ohm coil. The iStick will not let me adjust the wattage any higher on this coil.