Re: Finding chord shapes in same area of fretboard
Since you say you are a music theory nut, try Googling "voice leading." The basic idea is to try to connect the chord changes as much as possible in order to make the changes smooth, so that they sound less like a bunch of disjointed and disconnected chords. Then, you have the control to throw in a big leap on occasion so it comes across as a surprise. You'll find most of the theory is applied to piano or guitar but it all works for mandolin, too.
You haven't told us what your playing situation is. That is, is this for solo playing? Or are you playing with a group where you don't necessarily need to play the bass notes?
So, if you have a bass player they are probably playing the root and the 5th of the chords. Is there any need for you to play those notes? Not really. So what's necessary for you to play to get across the harmonic information? I tend to play blues and jazz, so for me I need to play 3rds and 7ths. If you are playing bluegrass then I'd probably stay away from 7ths. I guess you could probably play root and 3rds or 3rds and 5ths. (Or, alternate between the root and 5th to make it more interesting for yourself.)
But by whittling down the chord to the minimum number of tones you need to express the harmony, you can work out easily fingered "chordlettes" that are quite close to each other. It also makes it nice to throw in passing tones as you are moving from one chord to the next that lead the ear to the next chord. They might get you some nasty looks since they'll be non-diatonic, but they'll sound really good in, say, a blues context. Or maybe no one in the bluegrass group will notice since everyone's ears are really trained to accept the bluesy sound anyway.
At any rate, that's the road that I'm traveling these days. I'm trying to break away from a bunch of memorized, static chord shapes so I can play moving lines of harmony that flow. Your mileage may vary.
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Andy
"Not to know the mandolin is to argue oneself unknown...." --Clara Lanza, 1886
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