First off, I mistakenly posted this in "container gardening" and feel it may have been posted in the wrong form.

Tree including pot is almost 6' tall. The pot is 14" deep x 16" in diameter. The tree is extremely healthy and has put out a lot of new growth this summer. It's been outside reviving direct sunlight (I slowly acclimated it in late May) and has really thrived.

ive read a lot about the gritty mix and how much better it is. However, I'll admit, this tree is growing in the basic MG potting mix. I will say, when repotting (I've done it twice with three tree) that I've used about 60% MG mix and 40% added perlite. The mix already has perlite, but I didn't feel it was enough to drain fast enough When watering, I water till it drains out the bottom and do not water again until the top 30-50% has dried. Even with the current soil, it dries out within 2-3 days.

i have not had any issues, but would also like to keep the tree in the best health for a long time.

question, how could I make the switch? Just adding gritty mix when potting up? But then the inside soil mass will hold more water. I also am not sure I feel comfortable removing much of the current soil because the entire pot is full of feeder roots. They've taken over to the point where you can life the tree and soil mass out of the pot and not a piece of dirt stays behind. From top to bottom, the entire outside of soil is taken over by the feeder roots. Also, it went from a 14" pot to this 16" only two months ago and I'm not planning on potting up again till next spring.

anyway, sorry for the lengthy message. I'm just not sure how to make the switch in the future or if I should just stay with MG with added perlite.

any opinions would be appreciated.

Here re is the tree currently: