Level 127, keep the infection small

At the lower section of level 127 I try to clear as much bubbles as possible to be prepared for the chain to unlock as the infection starts spreading as soon as the first lock is gone. I like it best when the infection is cut off short, so after I have unlocked the first chain I try to burst away the bubbles in the middle first. To score good at level 127 I gather up green spiders to let the infection drops on.