I'm sorry, I have no experience with gourds and little with plants in pots. But I hate to see anyone's question sit unacknowledged.

I'd try feeding lightly and cautiously -- just a pinch of balanced fertilizer once a week or so. Its easier to correct underfeeding later than to watch fertilizer-burned plants die.

I'd shade the pots to keep the roots cool but not worry about shading the vines themselves. Squash family plant leaves will wilt in the hottest part of the day as a natural means of conserving water. They perk back up in the cool of the evening.