I think 300 feet is too low. It's a close call even on an Estes Asender sometimes.
Watch, and Watch how to fold the JLCR chute on John Bean's videos. If you just chose random videos you get others doing it their way and not the maker's way.
When I used my JLCR the first time I didn't watch a video, "I've been packin' chutes for decades, I know how to do it" Well that was Not the way to do it, release opened but chute did not catch air. Got a bend in the tube by the fins on my "test" rocket. [A 2" Estes Majestic on 29mm BP motors ]
Tried again, bend got a little worse on the test rocket. OK OK, watch the video, watch them pack it, learn the way to do it...
Then it worked on the test rocket and then my intended rockets. Next launch I get to go to, I am watching the video again, its been since 2021 that I got to fly so I will learn "That's the way you do it" all over again.
Best one in 2018 bringing back my LOC Caliber ISP painted like a D-Region Tomahawk, even the decal said D-Region ISP
The I-65 is a plugged 54mm motor an took it to just touch 1 mile, so the payload bay had a Strato Logger fire only an Apogee charge, and the JLRC was set for a 700 or 500 main, I can't remember. I did not want to turn that rocket into Dual Deploy. I like the JLCR method now.
edit: Weight of the rocket with no motor was 3.0 pounds. Fin can built with Gorilla glue, tube slotted to fit over fin can. No outside fillets. Fins only sealed to tube to keep air out.
RSO was wanting 20 degree tilts into the wind, due to wind. Rocket weather cocked really bad into the wind. I would have tilted it with the wind , it would have gone mostly straight up and got a lot more altitude.