The worst case a friend experienced was Efke 50 at 400. I worked out something like 15 mins in Acufine, he finally used Ilfosol for 30 min. But Efke 50 in ID-11 is almost 100 ISO. With Rodinal another friend pushed HP5+ to 1600 in 80 mins 1:100, agaition every 5 mins. I do not have any APX 25 in stock to test it, but I would advice a clip test in Rodinal 1:100 for 90 mins with low agaition.(posted 8486 days ago)Regards,
Wolfram