Tricky situation. The Lowdon that I bought 20 years ago was probably the loudest guitar I've ever heard. Some folks think it's a too trebly, but it depends on who plays it. Currently my working guitar is a very small Martin 0-18 (1950 vintage). In a room it's about average volume, but from a stage, carries like crazy. My feeling is that your guitar will probably be fine. Just trust it. Internal amplification will make it louder, but it won't sound like the original guitar. That's the big problem. Acoustic guitars just weren't meant to have the volume of electrics.
Rick