I haven't vaped those specific liquids, but given the rave reviews, I think there may be some experimentation to be done.
I would definitely consider playing with voltage, as gurgling can be a sign that you're drawing more liquid onto the wick than the coil can vapourise. 4.2V generally is the high end though, so if you start getting a burnt taste, back it off quickly to avoid burning the juice. Some flavours like a cooler coil too (usually fruity flavours) so excessive volts can reduce the flavour. Experiment a bit and see how you go. Also, check that no liquid has dripped down the centre post to the contacts of the Vamo, as this can really reduce the current going to the coil.
As above, try different ways of drawing on your ecig. Unlike a burning smoke, drawing harder doesn't = more vapour, as the coil can only vapourise so much at a certain voltage. Long slow draws (experiment here) are the rule of thumb.
I know some chaps have spoken about removing a part of the wick in the protank to improve flavour (I could be getting mixed up with the Evod here though) so perhaps someone who uses the protank could offer some advice here.
I've removed one of the flavour wicks on my KPT - much better vapour production and cleaner taste.
I also would recommend switching to Variable Wattage on your Vamo - I found it gives more precise control over finding the "sweet spot".
Also, did you put the Vamo into Mode N02? This also improves things...