The middle can is usually
USB - guess you found one of the not so usual ones
Good to see you got it better. Don't go for perfection with this radio, if you get it "spot on" on Mondays it will drift a bit by Tuesday... if you want drift free buy a better radio.
I did not touch the other cans .. what are they for ?
Hmmm, where do we start? IF Carrier oscillator frequency, IF alignment, mixer alignments (one for transmit, one for receive), RF stage alignment, tank circuits, output stage low pass filter, squelch thresholds, meter FSD adjustments, carrier level, SSB ALC, and AM AMC alignment. Plus any others I've forgotten about in the 10 years since we last saw one of those things in the workshop.
Resist the temptation to randomly "twiddle" in the hope of improving the radio if it's working OK, unless you know exactly what you are doing.
At best, you won't get any improvement, and at worst you'll be sending it on a trip to someone like myself who will only be too happy (with $$$
) to put them all back in the right place
PS: Found a schematic if you are interested...