Well, I have found that 90% of all pinholes can be eliminated with either one of two approaches. Either a pre-wet or better initial agitation will eliminate them. The other 5% vanish if you use both. Or vice versa. It has never been proven to be the case unless the film was grossly underhardened.
I demonstrated what can happen to my last workshop members. If you use an acid stop, you do NOT get pinholes. If the film or paper is soft enough for carbon dioxide to hurt it, you get blisters just like those seen on sunburned skin. Then they either burst or they dry down. In the former case, they leave ugly scars on the film, and in the latter case they leave a fish scale appearnce.
I ran these tests over and over at EK testing the new hardner in the mid 60s. I know what it looks like and how it behaves. I also worked on the crossover from the old to new hardener and from Kodalk to Carbonate in the EP2/3 process. No problems were seen.
Remember that you can use an acid stop with C41 and RA processes and that is used at 100F. It causes no problem.
Hope this helps.