unable to set "tags" file in front of "tags" option

Hi, I build my tags options like:

source $NHI1_HOME/example/.vimrc
set tags+=$NHI1_HOME/theKernel/jv/tags
set tags+=$NHI1_HOME/theLink/jv/tags
set tags+=$NHI1_HOME/theConfig/jv/tags
set tags+=$NHI1_HOME/theSq3Lite/jv/tags

with the most specific tags files at the end (+=). my problem is that I want the most specific tags file in the FRONT of the tags option.

I'm a little embarrassed to ask such a simple question, but since Vim has decided to use a somewhat "unusual" custom development as a "programming language", I unfortunately have no choice but to go down this route.

Normally I would assume that something like:
> set tags=/my/file/to/tags,$tags
would work, but it just doesn't.

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