4x4 redux to yau transition: why am I not getting better? :(

I used to avg sub 1:30 with redux, and now I avg like sub 3 min :( is the transition usually like this or am I doing something wrong?
I used to average 1:40 with redux, but then when I switched to Yau I could barely get sub-2. After a little practice though I started to average sub-1:30, and with the help of a new magnetic 4x4 I now average 1:10
 
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