I probably should have added that augmenting in some silica (by itself--still cutting out most of the other crap I have been feeding my plants) is still a large step down for me when it comes to playing around with my plants.
I would prefer to find a source of silica that can be added straight to my mix prior to pot up but by the sounds of it, such sources of silica either require time to break down or are simply a form of silica that is not available to plants. I am a bit hesitant to do it, but I will most probably end up going for and regularly feeding my plants a liquid source (i.e. micronised diatomaceous earth). That being said, my current worm-fish-seaweed based liquid fertilizer/plant food *does* already contain small amounts of silica... I just want to push the levels a little bit and see if I notice any improvement--even in the slightest--in plant strength and pest resistance. It is also said that silica should assist in a plant's ability to take up minerals (really then, eliminating the so-called "need" to be feeding plants obscene amounts of minerals).
Either I'm getting better at focussing on what's really important... or I haven't really learned anything at all!