@Trapper
What ratios are you mixing the lime and perlite with the 707?
So far I've just been using it right out of the bag, no amendments.
What's your secret
I've eased up on the Lime a little...went from 1 tablespoon per gallon of medium
to 1/2 tablespoon per gallon...and no extra chunky perlite this time.
I've been finding 2 things....
707 doesn't hold salt like the

HF did (or at least it doesn't experience pH issues
as a result of salt build-up) and with the Garden Lime in there, it's actually hard
to get the pH to go below 6.4-6.5 for any amount of time during veg and almost
impossible during flower (Synth nutes vs. Organic nutes) It likes to hang around
6.7-6.8 most of the time and only drops to 6.3 soaking wet, with a big, synthetic
feed. I've actually been butting pH Down in it during veg.
So I'm a lot closer to unamended than last time
It's good stuff, I've been very happy with it.