Over the past patches these checks are becoming less effective for blob control. KV8, German rocket half track, Katyusha have been adjusted and no longer effectively counter the blobs.
Well the problem with those units wasn't so much that they countered blobs, but that they countered anything with 2 feet and a rifle. Yes they fought blobs well, but that was just a side-effect of the fact that they annihilated non-blobs just as hard.
The best counter to blobs would be increased damage to units within the blobs. I used to say increased accuracy, but I realise that increased damage would increase the effectiveness explosive counters against them as well.