First of all, I haven't figured out how to get GSA to penetrate my firewalls. I can get on the Dyna, but GSA, no.
But man, this has turned into a really good thread on X-ships!
The problem with Taldren's 2nd gen X-ships is that they were created without any systematic method to provide balance. Once you assign a relative value to all the weapons available and disregard Taldren's configuration, bringing them in line is not that difficult. The stock shiplist is full of errors and oversights that you need to deal with as well; for instance, while the hvy cruisers all have the same move base, the frigates are all over the map.
The only X-weapon that might be over-powered is the Hvy Photon. MRVs come into line with just a small reduction in number and improved defences on all ships. This does require other improvement to Mirak ships so they can still compete! The PG2 is not that powerful when the ships are made to match, it's simply worth slightly more than 2 X-phasers. As far as other weapons go, they are usually underpowered. Fast plasma and plasma snares are not particularly more powerful than standard weapons, and the ESG Lance is much less useful than a standard ESG. As far as the the hvy phasers go, they just don't have the power of other weapons. Hvy disruptors are about right in all regards, and a full spread consumes fewer hardpoints than the equivalent in standard disruptors.
On my off-line computer, I have a vastly expanded armada of 2nd gen X-ships. I think they are reasonably balanced. Some ships, like the F-XCA are hardly altered, but others bare no resemblance to the stock ships.