Hi Gracie. It's so nice to hear from another (potential) St. Lucia bride!
I am not using an offsite wedding planner (Villa Capri comes with one who I LOVE), but before booking the villa, I had contacted both Tropical Isle Weddings and Awesome Caribbean Weddings. Both gave pretty quick responses. One thing to remember is that much like Europe, a lot of St. Lucia goes on holiday for the month of August. My WC was away for 3 1/2 weeks and the restaurant I am (hopefully) using for the reception dinner was closed the entire month.
I have heard excellent things about both companies. Honestly, I think you'll be happy with either one. If you're having more luck with Topical Isle, then go with them.
And yes, please join Velda and me on the official St. Lucia brides website. I have posted quite a bit of info on there, but please feel free to ask me anything. I'm not guaranteeing I have the answer, but I can try!