I use straight coco. So long as you have good drainage holes there should be no issues.
My suggestion, if you're going to treat it like hydro feeding/watering daily, you don't need perlite. If you're treating it like soil and watering every few days, add perlite.
Also, if you're not planning to transplant out of those 1 gallon pots, I'd go bigger. I'm running a 1 gal experiment in coco and she needs watering 3x/day compared to 1x/day in 5 gallons.