There are many basses out there in different sizes, styles and necks. Find one that fits you hands and keep it. If you have the money have one built to you, or order the body and neck from a supplier and make your own. Custom fit basses to your hands is the best solution for any player.
One finger per fret is something that you aspire to after years and years of playing, not something you just do. Where as i can do it easy and simple on my precision there are those that can't, so it means nothing to say you must or should play one finger one fret.
Again i will say that the biggest problems i find in injuries come from players trying to do things they are not capable of doing. The either see or read something and off they go to do it without stopping to think of the consequences.
After all its only playing, people always say" you need no more strength to play than normal"....well there on the way to finding out how wrong that statement is.
Left hand is about function, the function is to hold down a string within movement, in response to the right hand action of striking it.
http://blogs.myspace.com/index.cfm?f...ogId=475980040
Check out the link, it has points to look for and points to avoid in building a technique. Check out the other blogs for a feel for this information, any questions drop me a PM.
