I got a B16B engine and a S80 Gearbox with some unknown aftermarket gears in it, at least it got an aftermarket LSD.
The problem is: It is always hard to shift when it drives a while or everythings are hot, It is smoother to shift when it is raining. I changed Transmission fluid from Honda MTF to KAAZ LSD oil to reduce the clicking sound when turning corners. Until a day, I cant put the gears stick into second while down shift, it feels like there is a wall blocking it. so i try to move back to neut when i am still clutch in, then rev, then put into second, same thing, sth blocked. still clutch in until the car fully stopped, still unable to put into second. I have to put back into neut and step the clutch few times to let me get into second. This made me think it is something do with my clutch.
Another day i tried to reverse and i hold the clutch at balance point, the car moves slowly in a constant speed, but it suddenly stopped although i didn't move my left foot. It is like the balance point is some time high, some time low. then i try to put back in to neutural, The gear stick stuck in reverse, the only method is to force it back to neutural or fully release the clutch, let the car moves a bit and press it again then i can put back to neut.
In normal days, i heel toe every corner and it helps me to put in second but it is hard, even harder in every gears no matter upshift or downshift when it is hot. Tried double declutch as well, but it is still hard to put into second, feels like it didn't select into the perfect position.
Sometimes It is into second put it is not actually in any gear and the gearbox is spinning or something. sometimes it poped out from second.
I changed Excedy oem Type R clutch and release bearing when i took my gearbox out. I changed Clutch master cylinder, I change the gearbox oil to KAAZ to make it smoother, but it is still hard when hot. I changed Shifter bushings, then the second gear problem occur. I went to a GB specialist and they said it is not my gearbox although i prepared to rebuild it. They said it is something with the clutch and the shift linkage.
Then I changed the shift linkage, but same it is hard when hot and second gear problem.

Notes: I do not have front transmission bracket, i am running the trans top, rear L, the one near the cam cover and the A/C bracket.
No crunching sound, but there is a quick spinning sound when i release the throttle when the rev drops from high to low
So here are the questions
1: How to check Clutch slave, Master and clutch line properly.
2: How to check engine mount properly.
3: Please advise how to solve the problemsss