... not to mention night fighting tactics...
Given the results of the night fighting which occurred after Jutland, I've understandable concerns about the constant references to WW1 German naval night fighting capabilities on these boards.
... the Germans could be forgiven for the thought that they could inflict massive casualties in comparison to those received.
They had that belief in the OTL and, in a handful of encounters, never quite managed to pull it off. Then, after May 31st/June 1st 1916 they never really tried to pull it off again.
You're very correct when you suggest that one success will lead to future attempts. However one success won't necessarily lead to future successes and the HSF will more plausibly find itself in the same situation it faced in the OTL: Rusting away at anchor while locked in port by both the distant Grand Fleet and the Kaiser's fears.
Its true that one victory wouldn't do the trick but thats no reason for the HSF to throw in the towel.
I'm not suggesting they immediately throw in the towel. After all, they didn't in the OTL after several near misses until the incredibly lucky escape at Jutland scared the bejabbers out of any thoughtful HSF officer.
I am suggesting that an early success by the HSF may lead to more attempts by the HSF which could very well lead to a disaster for the HSF.
The Grand Fleet's "failure" at Jutland prompted all sorts of organizational and other improvements in the RN not the least of which involved Room 40 and redesigned shells. An earlier defeat at Scarborough won't provide the HSF with numerical parity and will provide the RN with the same impetus it had after Jutland.
Increased hubris on the part of the HSF, a numerical advantage still on the RN's part, a Room 40 still working and being paid attention to, and earlier improvements by the RN to things like shells and signaling could add up to a disaster for Germany.