A couple options: 1. Cut out crack climbing and focus on sport climbing or bouldering. 2. Do a longer power endurance day and add some crack climbing to that day. 3. Alternate power endurance 4x4s one week with crack climbing the next.
There is much anecdotal evidence of major gains by simply hangboarding several times a week so expect gains. In fact with the extra rest days, you might get stronger faster. You'll be trading off technical advancement for more pure power and fitness gains.