I know I'm splitting hairs here, but I'm not quite sure where you got those graduate numbers for Wake Forest... according to
WFU | Visitors' Center | Quick Facts Wake has 2,386 graduate students. at the graduate school alone there are 1,200 students. which gives a 65% undergrad total. the OP also mentioned a strong sense of community...
no matter how many/few graduates there are, the larger the undergrad population gets, the less cohesive it's going to be. this is why I suggested the LACs I did, as even the small universities have at least ~4,500 students. LACs also usually require students to live on campus all 4 years, which adds to the sense of community.
I do think these small universities are wonderful, and are also in the "sweet spot" of size... it's just that there are going to be sizeable graduate programs and slightly less cohesion and community. on the other end of the sweet spot are the large LACs, which cant offer as many courses or opportunities. I'm suggesting the OP may prefer the LAC end of the spectrum, but also recognizing the small universities are also a good choice.
Oh, and add Vassar. ~2,500 students IIRC