I definitely wouldn't add any "Miracle Grow" brand perlite which has been tainted with synthetic fertilizer to any kind of organic soil, Ocean Forest included. I know that most people don't realize how soils are [and should be] alive with various interrelating, interactive, symbiotic (mutually beneficial) micro-organisms or how synthetic salts kill or shock these organisms, upset the delicate balance out of their favor and hinder their capacity to do really good things for our plants (like seek out, sequester and mineralize the nutrients they need when they need them and keep disease-causing organisms at bay)- but it's true.
To get the most out of a soil like Ocean Forest and grow your plants to their full genetic potential, thereby achieving the best quality finished product, it really helps to at least be aware that there is lots of life in soil and that life needs to be protected from things like chlorinated tap water and synthetic salts (including pH Up).
Aside from all of that, Ocean Forest usually seems to have enough perlite- too much if you ask me. Some people reason that copious amounts of perlite helps to ensure proper drainage/aeration, and I used to be among them. I feel differently now though, and I no longer feel comfortable using a mix that is 20% perlite or even 10%. Perlite just isn't an ideal amendment to be using in those amounts for a soil organics grow. Sure it holds some water and is light and airy, but it also dries out quickly and it has zero nutritive value. I also don't believe that microbes would be able to colonize it like some other materials.
There are various other amendments that we can use for the purpose of helping drainage, water/nutrient retention and keeping things aerated in conjunction with a small amount of perlite and coco coir; sphagnum peat moss is light and airy, holds water and nutrients, earthworm castings help with aeration and are nutrient rich, but humus is just about the best amendment as it holds water, nutrients, air and is full of life.
