Of course, if this decision doesn't make sense to you that's because it's not really meant to make sense.
As Pensions & Investments notes, CalPERS' decision to hike their equity allocation had absolutely nothing to do with their opinion of relative value between assets classes and nothing to do with traditional valuation metrics that a rational investor might like to see before buying a stake in a business but rather had everything to do with gaming pension accounting rules to make their insolvent fund look a bit better. You see, making the rational decision to lower their exposure to the massive equity bubble could have resulted in CalPERS having to also lower their discount rate for future liabilities...a move which would require more contributions from cities, towns, school districts, etc. and could bring the whole ponzi crashing down.
The new allocation, which goes into effect July 1, 2018, supports CalPERS' 7% annualized assumed rate of return. The investment committee was considering four options, including one that lowered the rate of return to 6.5% by slashing equity exposure and another that increased it to 7.25% by increasing the exposure to almost 60% of the portfolio.