Let me make a clarification:
When I say make combat sensors 10-20% more effective than ecm, I mean it as in a 30% bonus is "20%" more than a 25% bonus. Not as 30% compared to 10% is 20% more. Does that make sense?
Here are some actual values you may want to use:
Combat Sensors I-X: 6-12-18-24-30-36-42-48-54-60
ECM I-X: 5-10-15-20-25-30-35-40-45-50
Cap training at about 10% for both ships and fleets.