According to the Blake Documents, apart from the remnants of Clinton's Cutthroats The Blood let their military slide into near nothingness over the long years. Perhaps the rise of the WoB began with Thomas Marik re-birth and that by 3052, after 20 years, the framework was there, but without a lot of the heavy hitters lined up yet.
There's also some expiration time for a build up if you use the Manei Domini as your foundation. Remember, those advanced cybernetics reduce an individual's life expectancy exponentially, and the ones deployed by the WoB were their first and last (for canon reasons) two "releases" - meaning the tech was relatively new to a widespread deployment.
Here's some help to keep it in perspective...
VDNI for example had a base version and then a refined variant that was released a little time after. The tech itself was only available from dissecting captured Clan-Tech (so already 3052+), and then re-engineering the neural interface into something useful. Given what the WoB was doing prior to the Jihad, it seems pretty reasonable to see why the advanced VDNI was released AFTER the Jihad started, and not prior. The primary version was probably only released into general use only a year or two prior to the outbreak of the Jihad.
So if the VDNI was being researched and deployed after the start of the Clan Invasion, or even after the Schism (which is more likely for practical research with the intent of replication), then the idea that the Blood were actively preparing for combat prior to the invasion is pretty low if you're looking to keep the connection between the WoB and Blood intact.
It's one of the problems with using the Blood and the WoB.
There's simply no
logical reason to refrain from preparing for the inevitable return of the Clans. Even with manpower losses, and fear of an immediate counter-invasion (unlikely given how large the clans were at the time - which the Wolverines would know.), you'd have centuries to develop effective countermeasures.
IMO, it's a mark against using the Blood as a "real" anti-Clan faction.