Generally I think if the DI sound isn't up to the acoustic sound - then perhaps its a mismatch of guitar and transducer.

Its not a case of one size fits all. there are happy accidents, and unfortunate pairings.

At the moment I'm a big fan of the k&k product - I have two of the pure western models. It works like a dream for the guitar I play at present (Faith Jupiter off e-bay for £150).

I also have an LR Baggs system which came with my upmarket Yamaha which is good.

However a Martin Thinline didn't seem to suit a D35 that passed through my hands and a Shadow didn't really hit it off with a Rob Armstrong - earlier in my career.