Faster SHIFTOUT without dedicated hardware, possible?

[CuriousOne]

The above code works fine with TM1629A display.
But it does not work properly with APA102C leds.
I have the following statement:

SHIFTOUT di, ci, 1,[224+Bri[x],COLORS[X+16],COLORS[X+8],COLORS[X]]

Which I have replaced with

wreg=224+Bri[x]
gosub shout
wreg=COLORS[X+16]
gosub shout
wreg=COLORS[X+8]
gosub shout
wreg=COLORS[X]
gosub shout

The issue is that only odd bytes got transferred.
Say if I set some value to 2 or 4 it gets delivered to LEDs, but if I set it to 1 or 3 or 5 - nothing happens.
Tried to insert pause between each subroutine call - no difference

[CuriousOne]

I also tried to add some NOPs as suggested above - no difference.

[tumbleweed]

Don't know what to tell you... the routine transfers any values for WREG so there's no difference between odd/even values.

Must be some issue with the APA102C timing/format.

[CuriousOne]

I will hook up scope and check both "versions", to find the possible issue.