Being that it is a very light and small guitar, would the light/mediums put too much tension on the guitar and potentially cause the bridge to lift?
That's one possibility, the other is the tension on the neck which pulls the headstock towards the bridge and causes the neck to "cave in" to the top. Granted it's a long slow process(years) which evidences itself by rising string height/poor intonation, but ultimately the neck needs to be reset, the single most costly repair a guitar can need.
Not sure what you meant by "light/medium" and I don't know what the Elixir "light" gauge set is, but here's the "theory":
Good makers like Guild start by deciding what string gauge the guitar's going to use and then design the guitar, especially the top, to make the best use of that tension.
So going to mediums is no guarantee of "better" tone. You might get better volume at the expense of lost sustain, for example, because the top is too "tight" with the heavier strings, it can't resonate to its optimum.
New Hartford put a LOT of effort into their top designs.
There's folks here who say, sure, try a heavier gauge, use what sounds best to you, a guitar's only got a limited life anyway, get the most from it while you can..and I can't argue with that.
BUT, there's a lot of us who believe
for sure if you use heavier strings than it was designed for you're going to need a neck reset for sure, sooner rather than later (if ever, when using the factory spec gauge. My D25's 19 years old and still has dead perfect alignment, and never lacked for volume using the factory spec lights)
So I'm just trying to present the pros, cons and "whys".
There're also gauge sets like "Bluegrass" that mix medium bass strings with light trebles, and Like Geoguy, I'd also suggest trying out some D'Addario EJ-16,
uncoated PB lights, .012-.053, compared to the EXP-16
coated lights that New Hartford shipped 'em with.