Currently G1 uses an alpha of 0.95 for its adaptive IHOP allocation rate calculation, i.e. the latest value is weighed at 95%.

Behavior seems to be the same with the default value; in order to reduce the amount of magic numbers I propose to use the default 0.7 instead for now.

There is no good explanation of why, and the original change does not clarify either. Investigate whether a better value can be found.