I want to suggest PG stop rewarding failed Mega runs in all PVP. The practice of stopping megas at 30% or lower is ridiculous.
I feel you should have to beat the base for points and this means a minimum of 70%. I like the sliding scale but this is what I feel it should look like:
100% -95% = 100% of Mega
94%-80% = 50% of Mega
79%-70% = 30% of Mega
70% below = 0
How in a war game are you rewarded for failing! Pick better targets and then get points.