your car doesn't code until a deviation of +/- 9 degrees, so i would wait for that. i got a deviation of -16 when my actuators failed (catastrophically) and no valve interference issues so nothing is going to break.
tech is right, i think deviations from the factory can be quite high (mis-aligned sensors). take the -7.61 as a baseline, drive the car, check often. most likely variocam actuator pads are the issue and will continue to deteriorate. this will be evident in an increasing deviation number.
work can be done with engine in the car. be prepared to replace a few other things while in there; chains (cheap) update your three tensioners if needed, and do some hard thinking about replacing your actuators - they are very expensive but do fail, and replacing them while you are in there *might* save the trip back in at a later date - all about your risk tolerance.
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