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Are there any other ratios that you would suggest?
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Half and half Miracle-Gro and Perlite. (More of a hydroponic
setup really, and I don't know if it would wick efficiently.
The wicking basket might need to be full of all potting
mix.)
Ami had mentioned one time getting perlite used as insulation
for less than the cost of horticultural perlite. I do not know
who carries it, though, or what the particle size is. You can get
some idea of the different perlite applications by looking at
the products list at a manufacturer like Nor Cal. For example,
they have a Jumbo horticultural perlite mainly used for
hydroponics:
http://www.norcalperlite.com/NorCal5.htm
(That sounds perfect for what you want.)
Turface MVP might work despite holding water itself
(still supplies a lot of air space), one would just have
to try it and see (and see how much it costs compared
to an equal volume of perlite).
So, one other test: 3/4 potting mix, either brand, with 1/4
Turface MVP.