two things here:
- upslash the first aspid as soon as you can and charge the cdash a bit to the left, this way you have very high chance of pushing him away, so his spawned babies won't be on the way. Very comfy
- don't instantly dash away after freeing the grub, instead kickstart your movement by pogoing the spike that just fell down, and then use another background object to setup the dash right under the acid. It's a bit tight and saves about 0.3, no biggie if you miss it, it'll still be faster than previous movement strat with dashing instantly away from grub
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