That's cool, but odd. Normally bronze wound strings with mag pickups sound pretty weak because the only thing the mag is picking up is the steel core of the string which doesn't have a lot of mass.
There are magnetic pickups made for acoustic guitars that fit in the soundhole of an acoustic guitar. Some more expensive units put out a good acoustic - ish sound. Leo Kotke comes to mind.
There may be an imbalance in output between the plain steel strings and the bronze wound strings of a set of acoustic strings, through other types of pickups.
I am a cheap-ass most of the time. I get Musicians Gear strings from Musicians Friend. They have acoustic and electric strings and lights, mediums etc. Good strings! For just over $2.00 a set and free shipping.
I make the occasional exception. My one and only factory six has Elixirs. They last a long while, play easy and sound good. And my Swamp Witch. I stick with strings from the Anonymous Pick.
Also, I like electric strings for slide.