TPS61169: Improve output efficiency

Dear all：

     I use BQ25606 for charge management, and the input voltage is 7V.The battery USES 3.7v double lithium batteries in parallel.Output 4.2v to TPS61169 for boost output 12V.

Now I output with 12V/ 0.2A, and the output efficiency is only 73%. This efficiency is A little low, is there any way to improve the efficiency?Here is the schematic

Thank you！