IMO, this is a step in the right direction, but still needs more taken off for Piloting to be anywhere near as useful as Gunnery. I've run an online campaign for two years with +10% for Piloting and people generally liked it better than +15%. However, people still shied away from voluntarily gaining levels for their pilots until it was lowered to the BV1 level of +5%, and without multiplication against Gunnery. (3/4 = +25% instead of +26%)
The only reason for it to have gone from +5% up to +15%, originally, was that physical combat no longer depended on a table, but on the skill itself. So kicking/punching needed an increased cost as you gained in Piloting skill. However, since BV2 already includes the 'Mech tonnage in the Offensive BV score, then multiplies it by a speed factor... You're already paying for physicals in the calculation.
Example: Berserker BRZ-A3 is 100 tons.
100 (tons) * 1.37 (Offensive Speed Factor) = 137 BV for physical combat at 4/5
The +5%, in my opinion, was already sufficient to account for the increase in accuracy for kicks and punches, as well as the "not falling down" skill. Nobody knew that at the time, however, since physicals had never before in the game's history been affected by Piloting skill. We now know that Piloting is severely over-valued, and especially so at +15%. People will certainly appreciate the 5% drop, but as it's still multiplied against the Gunnery skill (for whatever reason? -- I can't wrap my head around that), you're still overpaying for a skill that's been double-dipped during the BV calculation.
I'm hoping that it'll drop again someday. I know that after 2 more years of play testing with the BV1 table, the +5% cost for Piloting levels has not unbalanced our games in any way. People actually volunteer to level pilots, which is eye-opening after so many years of hearing gripes and grumbles when being forced to play with anything better than a 3/5. :)