currently peeking at 1.5bar and flatting out at 1

Whats up with that? is this something to do with your fully mabable ecu or just dodgy actuator?

A big intercooler will defnetly help as by the time u boot it threw 3rd and change up your acts will be threw the roof, i wouldnt run much more then a bar on std intercooler buy your self and act gauge and see how long it takes for the readings to go off the gauge i reckon it will be off by the time your part way threw 4th, aparently its bad for the engine after 70 oC the gauge i have from scc stops at 69oC