Help Optimizing Whimsicott/Gholdengo Balance Team

The team is built around Tailwind support from Whimsicott, with Gholdengo serving as the main offensive core.

Overall, the team has been performing well, but I've been hardstuck at my current rank and feel like I'm missing something. I particularly struggle against Mega Staraptor teams, Farigiraf teams, and Rain teams.

I'd appreciate any feedback on potential weaknesses in the team, possible roster or move set changes, matchup advice. Any insights is greatly appreciated. Thanks in advance!