Black vine weevil / root weevils

So, I’ve got a problem—black vine weevils in my urban permaculture garden, going after my new peach trees, my beans, my horseradish, and even my strawberries. I’m seeing a few non-chemical recommendations for dealing with them:

1- they are driven out of the soil by damp, so “remove excess mulch.” I do a very deep mulch layer, so this could definitely be contributing. But also the mulch works really well and I’m hesitant to change it.

2- nematodes, apparently the only natural predators. My main concern here is doing it right—if I already have beetles, is it too late? Has anyone had success?

3- this is speculation, but the ornamentals that came with the house are basically all on the list of these guys’ favorite foods (rhododendrons, euonymus, hostas, cedum, phlox, etc.). Would replacing some of these help in the long term?

I am not familiar with that pest but I added your question to the forum for bugs where someone may be able to help.
As for the mulch question: Yes it can be so beneficial in one context and detrimental in another.

Not knowing your location and weather it is difficult to to know what to suggest.  AS a frequent and valued participant on permies you may find it useful to select your name in the upper right corner and edit your profile so that the location and climate information you are comfortable sharing is with your name each time you post as you can note under my name in this post.

As for the other plants that are susceptible that have well established they may have developed resistance or not been found yet.  So a point of observation is comparing their mulch and soil conditions and whether the are attacked .
I know with my grass mulching and sometime adding a tarp or carpet over the mulch the predators tend to reduce the detrimental bugs and slugs to a low level.  Over the winter it is habitat for snakes and moles so the larva and adults get consumed.