That battery is not good for vaping at below .75ohm, so the orchid is not a good or safe choice if you have it built as low as stated. Should be OK to use with your higher build, but not the battery I would be using in for vaping in a mech. As with any mech, make sure your contact is clean and with a praxis, make sure the inside where the button contacts the wall of the mod does not have any dirt/grease/etc built up. Praxis has a cleaning guide on their site if you are unsure about the workings of the device.
Due to the hybrid top of the Praxis, make sure your center pin on the orchid is adjusted out so the battery does not contact the outer ring (negative) of the atomizer. If the battery top (positive) contacts both the inner and outer part of the atomizer 510 connection it will hard short and could be a bad situation.
1.6 ohm on a mech is not going to get you a very heavy vape on a dripper. It shouldn't be less than old cartos though. Look into getting some safe chem, high drain batteries for using (with any device) for your lower ohm builds.
Great resource for batteries, safety and going lower ohm
http://www.e-cigarette-forum.com/fo...-discussion-safety-battery-info-warnings.html