Evo IX MR 6 speed

Basically, what's happening is at very low speeds, when I'm shifting down from 2nd to 1st I get a large vibration in the shifter/grind.
It basically won't go into first until I'm completely stopped.
Only going into 1st, Only at low speed.
*This issue is intermittent, which makes it even more weird.
Sometimes it's completely normal and I don't have any problems.

Not sure if it's coincidence or not, but I started having these issues more frequently right around the time I installed my BR shifter bushings and shifter base bushings.

Please help

 

You shouldn't be shifting into first until you come to a complete stop

 

You need to shift down to 1st when 2nd is too tall of a gear and stopping isn't an option.

 

I sure did right after installing my clutch last winter and it was perfect for months