To the OP, listen to me when I say this, keep your F-30R. I have the same guitar.. allow me to share my story as I too had second thoughts after receiving it.
I purchased my Guild F-30R several years ago, bought online, so I did not get to play it before hand. When I received it, I loved the way it looked. But upon playing it, it felt a bit lack lustre. Really wasn't in love.. at least at that point. I took it in for a set up to see if that would help but they returned the guitar to me saying no setup was needed. So at that point, I was really unsure.
Over time, I learned how to do my own truss-rod adjustments which is key to having a good sounding/playing instrument. When that neck is at the perfect spot, everything sounds better, players better, more harmonic overtones. So that would the first step to making this guitar better, but I still wasn't in love with it.
So then came time to try different strings. I went through many kinds. One day I was looking at an F-30R online and noticed the fingerboard looked darker than mine. Thats when it clicked. My F-30R must have been sitting in a warehouse for sometime and dried out. So I went and bought some lemon oil. After oiling up the frets, and putting La Bella Medium-Light Silk and Steel strings on it, I at that point fell head-over-heels in love with my F-30R!! With the guitar more humidified and the mellow sound of Silk and Steel strings, I was able to get the most beautiful tone I've ever heard. And the harmonic overtones were just stunning.. unbelievable really. The feeling of the neck, perfect.
I highly highly recommend you try these strings and lemon oil the frets before you sell yours, as I'm sure it'll change the entire guitar. I also prefer mellow singing and this set up is perfect. I've also tried the Thomastik infield plectrums and while they are good, they are a bit bright for my taste and rather expensive. Though they give ever more harmonic overtones, so it depends what you are looking for.
I bought this guitar because its closest to what Paul Simon played in the 60s with Simon and Garfunkel, and that acoustic guitar tone is beyond perfect. And they were signing very soft folk vocal harmonies, and the guild never got in the way of that or was too loud. So please, take my advice.. it won't cost much but could change your whole perspective on this fantastic guitar.
I'll leave you with this... my Guild F-30R is my number one guitar.... even my number 1 instrument and I own loads of vintage instruments. Everyone I play it for comments on how beautiful it sounds. It is so easy to play, it practically plays itself. Would never ever part with it and consider myself lucky to have purchased it brand new before Guild took it out of their catalog.