Raising your power limit will help and it won't hurt the card. NVIDIA has so many safety locks that its impossible to damage these new cards.
NVIDIA boost 3.0 is the reason why your boost clocks are lower in certain games. Its dynamic speeds...which is a mixture of current temps, voltages, power and max temps.
Raising you voltage limits may allow for the card to sustain a higher boost clock but most likely it will dip down again depending on the load. Raising the target power limit will allow a higher boost clock since the card is now allowed to draw more power (even if the voltage stays the same).
Overclocking guide using a Gigabyte 1070 G1
http://www.overclockersclub.com/guides/gtx_1070_overclocking_guide/