Current split between ECM and cloaking seems good and halfway realistic to me, I wouldn't extend ECM to affect detection.
Imo, Cloaking has bigger problems than ECM as currently implemented: most of the time, splitting things into smaller packages is more efficient than cloaking/thermal reduction tech. While the upcoming version includes some additional economies of scale, I doubt this will change significantly.
Currently there are niche uses: you can split up a destroyer's armament over a squadron of fighters/FACs instead of fitting stealth tech, but you can't do that if the payload is one huge sensor. One stealthed sensor vessel coordinating fighters/FACs is quite effective, but with the upcoming change to sensor scaling that will probably not be worth the investment.