remove a few more instance variables
remove a few more instance variables

keepcosmos/rack,akihiro17/rack,davidcelis/rack,Eric-Guo/rack,keepcosmos/rack,wjordan/rack,laplaceliu/rack,eins78/rack,rwz/rack,deepj/rack,wjordan/rack,supzann3/rack,jackxxu/rack,gioele/rack,rwz/rack,eins78/rack,gioele/rack,wildjcrt/rack,maclover7/rack,deepj/rack,imtayadeway/rack,tylergannon/rack,laplaceliu/rack,imtayadeway/rack,imtayadeway/rack,wjordan/rack,davydovanton/rack,davidcelis/rack,supzann3/rack,ngpestelos/rack,gfvcastro/rack,tylergannon/rack,gioele/rack,akihiro17/rack,jackxxu/rack,shaneog/rack,davydovanton/rack,wildjcrt/rack,ngpestelos/rack,Eric-Guo/rack,ngpestelos/rack,liamseanbrady/rack,davydovanton/rack,gfvcastro/rack,davidcelis/rack,keepcosmos/rack,akihiro17/rack,jackxxu/rack,liamseanbrady/rack,eins78/rack,liamseanbrady/rack,Eric-Guo/rack,supzann3/rack,tylergannon/rack,maclover7/rack,laplaceliu/rack,wildjcrt/rack,deepj/rack,maclover7/rack,shaneog/rack,rwz/rack,shaneog/rack,gfvcastro/rack