This question really boils down to how much stress you can handle and also your personal priorities with respect to outdoor riding. The way I see it, you have a few options:
Mid-Week: Mid-Volume (TuWeTh)
Weekends: One ride from Mid-Volume (Sa), one outdoor
Mid-Week: Mid Volume (TuWeTh)
Option 3: Low Volume(TuTh)
The highest options represent the highest improvement potential. Keep in mind though, that it is just potential. If your body is not ready for that amount of stress, then you will be over-fatigued and will not see the improvements you hope to see.
Also, if a lack of riding outdoors (Option 1) leads to a decrease in motivation, this could also be detrimental to your training.
So in summary, pick the highest attainable (and sustainable) option for you
I hope I was able to deconstruct this a bit and help you decide which route works best for you!