So as many of you already know, for the insect glaive there is a certain path to feed your bug that results in an "ultimate kinsect" which will have max speed, decent power, decent stamina, and most importantly, has the "Extract Extend" ability which doubles juice durations.
If you didn't know then here are two Youtube guides from helpful pros who played the Japanese version of the game but gave a detailed account of how to make the bug path (and as long as you understand to use the 144 point bug feeds from the Wyvernian trader for Power, Speed, and Stamina you'll be able to exactly copy what's being done).
This is GaijinHunter's video: https://www.youtube.com/watch?v=uQdXcphlhmc
This is Melf's video which goes into more detail about all the various items (minus actual items for the glaives, like if you make a Magala glaive, youll need magala parts obviously,) the bug will consume in the path to upgrading and how much you'll need. The fey wyvern bones in English are called Avian Stoutbone: https://www.youtube.com/watch?v=o9vLyWOHn1s
Both are excellent guides to making the Ultimate Kinsect. Btw in English the Ultimate Kinsect's name is Bilbobrix.