my experience is the reverse... with lps-1.2 powering the ifi chain, i get less dynamic, sound is thinner/weaker.. i took it out within 5 mins. Not sure if anything done wrong, it's a definite NO from what i hear.
my setup is different from yours. you may want to consider how i connect, from laptop out-> idefender ->(mercury 3) igalvanic -> (mercury 3) micro iusb3 -> one micro usb cable(portapow power only cable) connect to idefender to power it, another usb(mercury3) connecting to my dac
do note that from my experience, idefender is very important in the chain as it provides a clean power to igalvanic, and it has the most uplifting effect.