i see so this could confirm that lubegard manual does help a ton in smoothing out the gear shifting as compared to stock and possibly using only redline MTL/MT85/90.
although yes, does not eliminate the notchy 1st/2nd gear shifting however 2nd gear almost fully eliminated while 1st gear is a LOT smoother.
in fact, i'm a LOT more comfortable downshifting 3 > 2 in high speeds compared to before (well a part of that is also thanks to nzh0920 tips/advises )

i didn't really gotten any extra "feedback" though, maybe cuz the additive helped smoothen out things further? in fact i kinda want more feedback for a more solid feel which as my budget allows i'll be getting the short shifter with solid aluminum bushings

i assume this is your first time changing gear oil on the inspira? i've been advised if i got the budget, changing more frequently on the first 20-50k km is good if i got the budget due to the metal shavings.
then again i prefer to just change it slightly earlier with use of additives (eg: lubegard)

and yeah from the gb oil drained out, can see a lot of sediments on the drained out oil container.
at only 1.7k km, my gb oil is around teh o color, quite clear, however yes it stinks, touching it have very rough feeling of sediments within the oil (eg: sandy feeling) and you can visibly seeing sediments sinking/building at the bottom of the oil container.

so i guess my decision to change the gb oil was a good one despite being just less than 1.7k km.