Yes Ian your right and its thanks to your suggestion and recommendation that I adopted it
I deliberately went to the low contrast end of the spectrum and it worked as anticipated, my intention is to up the time to 15 and then 16 until I get the right contrast, for me, with HP5+, although I did anticipate more adjacency effects.
I miss the 510 though, in using only one 100ml bottle I gained the confidence to increase temperature and reduce time, increase/reduce the development time for zone manipulation, I found it very easy to manipulate and, most importantly, consistent.
I have bought some Pyrogallol just in case I didn't find the Pyrocat HD as "adjustable".
But after the first test run, I am impressed and now sure that I will stick with it a while and get the hang of it eventually.