10 drops? That's way too much, just 3-4 drops is enough. Before applying make sure the liquid is at body temperature. The tinnitus should improve once the inflammation (being in the external or middle ear) is gone. How about your hearing?
I guess that the other advantage of getting the signal balanced from the mic is having twice the voltage, once you sum the legs. Considering they're tiny signals...
I'm using the plus. I tried it, compared it to Decibel, Amarra and a couple more, then decided it has a decent price-performance ratio and paid for it. I don't use iTunes--just to feed the iPod--, and have a good lot of DSD, 24/88-96 and FLAC files, so it filled well quite some needs.
I could live with that hadn't other amps, but some of my friends who listened to the combo (who by the way love the O2) found the HD800-B22 pairing unlistenable. To each one his own, I guess.
I was thinking there was a MBA with retina display, that'd be ideal Now seriously the weight isn't that different just 300grs. Battery life seems to be way larger, specially the 13" MBA.
For a bit more money you can swap the HDD in the rMBP for a SSD, so weighs are more similar and probably battery life will be longer too.