I also like both of these songs as they're very musical and very catchy tunes. I also agree about the drums getting lost in the mix though and it seems to lose out on clarity. On the first song, the vocals came across slightly loud (to my ears) and possibly could be lowered 1-2 dB.......(please take all of this with a grain of salt as this is only how it translated on my H-phones).
On Mi Unico Plan, I could see the strings/trumpet/horns working out really well if it's used as an intro to the song and possibly have an alternate slower piano melody for the break (of course, all of this is just my personal opinion and it certainly doesn't take anything away from this very nice tune). Good stuff you have going here Greg and IMO, just some minor tweaking/EQ'ing should fix it. :)