Plagron batmix and autos

Hey folks, new grower here, I will be potting up some Autos next week, I don't want to transplant though, for my last grow I used plant magic supreme soil but fancy a change this time round, I've been looking at batmix from Plagron, from what I've read it's way too hot for seedlings and as I mentioned I'd rather not transplant any of my autos. I was thinking about layering their bat mix with their light mix. Would this still carry the risk of burning them? I'm in 2 minds at the minute, do I just say fuck it and use their light mix instead or layer bat mix at the bottom and light mix at the topif I go down that path I'm not really sure the ratio I should use, any advice would be very much appreciated

 

[Jumping Jack Flash]

Fill your pot halfway with Batmix ( with clay pebbles at the bottom) and place a 1.5l coke bottle in the pot . Then fill around the bottle with the above medium.
Add some water to firm up the soil.....lift out the bottle and fill with lightmix .