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What you are missing here is the proportional value between the weight and lift.
The lift is determined by how much rotational velocity from the "flicking" of your wrist and the angle/length of the fins you were controlling. (Very simplified)
As you mentioned in the video, you switched to 3D printed body because the paper was not ridged enough to support the added weight of the components. But the rotational energy from "flicking" your wrist stays relatively the same as your weight increases.
You either need to dramatically reduce the weight or find a way to significantly increase the rotational velocity. So that your fins can redirect enough air downwards to counteract the additional weight.
I would suggest some thin balsa wood strips
Thanks for the info that’s really helpful lol, but the battery pack I was looking getting is basically just a holder (this link QTEATAK 8 Pack 18650 Battery Holder Bundle with Wire 1 18650 Battery Holder 3.7V, 2 Pcs, 2 Battery Holder 7.4V, 2 Pcs, 3 Battery Holder 11.1V, 2 Pcs, 4 Battery Holder 14.8V, 2 Pcs https://www.amazon.com/dp/B08B86KHB2/ref=cm_sw_r_cp_api_glt_fabc_GHJ9HVC0HJAT1Z09WHTD?_encoding=UTF8&psc=1) where I would hook the bms and bucks on to the wires coming from the holder.
Does this bms work? (https://www.amazon.com/Anmbest-Charger-Protection-Lithium-Battery/dp/B07KSQY67X) And correct me if I’m wrong but can’t I use my battery pack ( of 4 ) with 2 of those 2s bms’s that output to the same buck converter for the servos (either set to 6v or 7v depending on the servos I use) and a separate buck connected to the Arduino (set to 5v) ?
Arduino, breadboard, two dc motors, motor controller, jumper wires, a hot glue gun, and some random arts and crafts supplies like popsicle sticks, cardboard, etc.
Maybe a book of project ideas, these look good:
https://www.amazon.com/Make-Electronics-Learning-Through-Discovery/dp/1680450263/
https://www.amazon.com/Arduino-Project-Handbook-Practical-Projects/dp/1593276907