When do you take your basal?
When I was on MDI, I would take mine at night. (Like you, I only took my basal once a day).
I would reduce my basal the night after my training.
I tend to exercise after work (at about 6pm).
The reason for this was that my exercise is likely to have used up my liver glucose reserves so I had less to "drip" the next day.
I would handle the potential lows on the day of my training through extra carbs and/or lowering my bolus dose.
If my BG is higher during any day (which tended not to be a problem after exercise), I would correct through extra bolus.
I never felt the need to increase my insulin to carb ratio due to exercise.