The cursor blinks again, but I can't tweak it

The cursor blinks again, but with the following:

if has("gui_running")
  set guicursor^=a:blinkwait100-blinkon300-blinkoff300
endif

or also with += instead of ^= (i.e. append rather then prepend) I
cannot make the cursor blink on and off equally long, it always blinks
on longer than off (as is the default) in all the modes I've tested;
and yet typing

:verbose set gcr?<Enter>

at the keyboard displays my own setting and the .vimrc line where I've set it.

Even adding my blinking preferences manually for each mode separately
after ":set gcr=?" doesn't work.

Best regards,
Tony.

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