I agree with you, at $12 ea, change them just to see what happens. Maybe even see if you can order injectors that have a slightly larger output just for the experiment.
I have seriously thought about changing injectors but want to to the check valves on the fuel pumps first to kill the pressure bleed down gremlin I have. Cheapest Bosch injectors I found are $21 ea and the seats and seals are extra. Still running about $150 with shipping and all the seals. Apparently we have a little markup raquet going on here int he US.
What a great price on them!