Change the excerpt length

Only solution I can think of is that you use a new placeholder (eg. {{excerpt_long}}).

You can then write your own function to create an excerpt by using the wpt_production_excerpt_long filter.

It can be done even simpler by using the wpt_production_excerpt filter.

See this example:
https://gist.github.com/slimndap/1c5e90a8e1fc45291dac

Thanks!

I just dumped that in my functions.php. Is that the best place to dump it?

Yes!