Heinrich, good shoots. It looks like the lighting at your venue was more even than at the little actors theatre I shot in. The light levels of your shots seems to be LV 8.2 to LV 8.8. Did you apply any EV comp in PP?
You've adopted a relatively low ISO/low shutter speed strategy. That means you probably aimed for the static pose parts of the performance. The event I covered was a mixture of acting and song & dance so I had to go the high ISO route with my K20D & DA 55-300/F4-F5.8. The lighting was not even, very coloured, flashing (sometimes in the dancing they were underexposed or strangely coloured) and they also danced on the floor, which was not well- or evenly-lit. The illumination in my shots ranged from LV 8.9 down to LV 4.9! At the later light level it was impossible to get blur-free dance shots.
According to Table 2 at
Exposure value - Wikipedia, the free encyclopedia, indoor stage shows are LV 8-9, which is what we've got. This makes actions shots difficult.
The two shots below of my then 10 y.o. daughter, Uma, were taken with 1/250s, F5.6, ISO1600 which is LV 8.9. I used AWB. The shots were shockingly yellow at 3800K under the theatre lights. I've pulled them back to 2600K. The two spots on her forehead in the second shot are remnants of glitter that she'd applied.
Dan.