Wainscoting - narrow areas

Hi All, Installing some wooden baseboards now that I've finished laying tile. I'm having two main issues. One is that I can't seem to get the baseboards to blend nicely where they meet. I'm making clean angled cuts on the mitre saw but having issues. Here is an example: The other issue is that my nail gun is not always driving the 1.5" finishing nails flush into the baseboard. I have metal studs and am checking to make sure I avoid them with a stud finder. Using the NuMax[color=#222222] SFN64 nailer around 90 PSI (max suggested in manual) and I have played with the wheel adjustment on the tool. Some go flush or just below the surface while others protrude out. I have an image for that but having an issue attaching it for some reason. Appreciate any suggestions. [/color]

Hi to everyone, this is my first question in the forum: I'm adding 1/4" plywood panels to existing wall panels on an '74 mobile home. I will glue the panels and use nail on the studs. I'm doing this the first time and hope, that somebody can help me out with a few questions. I got myself a brad nailer 18G and I don't know what nails to use (galvanized, coated, heavy duty,...) and what length. Also, what distance for the nails is recommended. Thanks for replies in advance.