After some on/off cycles and chasing most of the leaks away I was able to pull my first shots this morning. The new springs are quite strong so I did not coarsen my grind size and used 15.5g of Saka Espresso Bar to good effect.
Unfortunately I'll need to stop and think what to do for addressing the one persistent leak (and one I expected): the hot water pipe fitting. After multiple attempts and applying more and more loctite 55 the worn threads on the fitting do not lock well to the boiler fitting threads, and a leak always develops. It is not like the modern San Marco machines that use a 3/8-1/4 BSP fitting as far as I know and uses a currently unknown thread size that is not BSP. I will need to investigate and see if a new fitting is necessary.

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