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With everything you have said I would be looking at the fuel pump and injectors. I wouldn't be stressing on an engine rebuild with those compression results. I mean you could maybe do a bearing roll in chassis if you think that your oil pressure is low???
I would change the oil, I have seen some oil usage when I have used other oils and basically only used delo or shell rimula with good results. Not a fan of Penrite.
Intercooler is neither here or there at your level of tune. It's nice and would help but no huge gain for the work/cost.