I'd only consider changing your insulin if you are having swings in your levels because of exercise. If I do exercise on Friday morning before work I'll drop my Lantus, then on Sunday I'll need to increase it back to what it was.
There is a plateau that I get to where my Lantus will not decrease any more. Its around 6 units. If I were in your routine I'd need to drop it by about 2 units (depending on how intense the session was) on Monday, Wednesday's exercise would keep me on the plateau as its within 48 hours and Friday is within 48 hours of Wednesday. So from Monday to Friday I'd be on the same then on Sunday I'd need to increase only to decrease on Monday.
If I wasn't on the plateau and started off at say 10u on Sunday, on Monday I'd drop it to 8, Wednesday to 6 and because that's my plateau id stay there on Friday. Does that all make sense?
Therefore if I had that routine I dont think I'd need to change my Lantus (except perhaps on the Sunday) because the exercise is evenly spread. Unfortunately, sometimes I can't be ***** to do exercise (work and life in general gets in the way too) so I can go a few days or a week without exercising. Hence I need to be dynamic with my Lantus because I go more than 48 hours between exercising.
The only way you can find out is to test intelligently and give your body the amount of insulin that it wants.