Dave,
You are definitely protected in PA. Don't give up. We have the same trouble at our range, very close neighbors...and a new home going up as I write this.
Our club has been here (South Central PA)the since 1930's, with over 900 members. We limit firing and practice from 8 a.m. to dusk (and to 11pm for the indoor range) Anyway, we started sending flyers out to all of our "new neighbors" notifying them of our Highpower Match dates and other Noise events. So far, so good. And, although you and I probably would look at living near a rifle range positively, you have to wonder why a non-shooter would build a house near a rifle club.
You might want to contact some neighboring clubs and see if you can start up a (I hate to say this ) outdoor smallbore league on the 200 yard range. And follow drowne1's suggestion...higher berms, noise abatement...maybe convert the Highpower range to a 100 yard reduced course...try to bring in new people. Thirty-four members just ain't enough. Sponsor Hunter Saftey courses, and if you have some NRA certified instructors hold some Youth Day shoots. Ultimately you need to become more visible in the community.
And contact the NRA, they have LOADS of range improvement information. They gave our club a huge 3-ring binder full of possibilities.
-Fred