Yes. Sorry about that. Thanks for sorting it out
I agree that a lot of troupes design Aura's at level 5 to avoid dealing with warping of the covenfolk and the environment itself. Also true that level 5 Aura's should be more common then level 7. I just opted for 7 to match the easy +7 in lab specialisation that you get in two seasons but level 5 is fine. Even at level 5, you seem to omit all environmental hazards that affect safety. This is a whole balance of covenant that is being ignored in your assesment. I think it would be fair to expect 2/3rds of the aura rating impacting safety negatively with various flaws for an addl. -3 to safety to your example.
Adjusting for the risk factor of the supernatural aura, safety is now Zero which is fine and does not cause immediate alarm.
Assuming our young mage has enough magic theory & ressources this works fine except safety is merely +2.
Not 100% acurate. The lab focus does grant a -2 to all activities except the activity in focus so the null aura lab provides +7 toward experimentation. Can also for one season get another +1 with refinement which requires magic theory 4 and might take some time to get MT 5+ for further refinement. The Aura lab grants +8 but carries 3 extra botch dices if experimentating. As the gold cord kicks in, you get to increase the risk for free in the null aura lab.
You'll also note that your main lab now is specialised in Experimentation with time wasted on safety. Two things you'll never get back. Your lab can only have two Specialisations so you probably want the 2nd one to be familiar as you do not want to experiment on that activity. So no extra on all the rest (Spells, objects, Longivity, etc.).
Situation becomes increasingly untenable as the aura is stronger. Even just at 6 you need more safety and it gets harder to get it. At 7 you might just as well forget it... until you are a mature magi & by then, you have better things to do then experimentation to have an extra die to lab total.
I think we can agree that in a low aura setting (1-5) you can manage experimentation if the setting does not have too much inherent safety hazards. Above that, it becomes increasingly taxing and probably warrants having a lab in a lower/null aura for experimentation needs.
W