If you say the stuka counters blobs then you haven't really used it.
Give the leig a suppression ability. Make it so you have to activate it. Similar to volley fire.
I have a screenshot at home in a 4v4 with my exactly 250kills with my stukas. Get yourself a InfaredHT like you should be and it is very much an antiblob weapon.
Do not give Leig a suppression ability. It was removed for a very good reason. No one wants to go back to long range suppression snipers. If you want to make it similar to volley then increased received accuracy on the unit like they do to RE's and you will see why no one ever uses it.
Honestly I play every faction and in 3v3 4v4 modes there is no reason not to build the InfraHT then you can bombard with Lieg and Stukas to your hearts content.