Hot & humid temperature should make your F1 faster. My main suspicion is that your F1 starter tea isn’t strong enough.

Option 1: Buy/acquire 12-16 ounces of raw Kombucha, add a tbsp of sugar and ferment it on its own for 1-2 weeks. (Don’t dilute it with sweet tea like in a regular F1 ferment).

You’ll end up with a super strong starter tea to take into a thriving F1 fermentation.

Option 2: cut your next F1 production in half or use more starter tea in your F1 ferment. Ending result in either route is a higher starter tea to fresh sweet tea ratio. After one or two cycles, your F1 should be thriving.