I like PvK's ideas on the APB/MB/PPB. I also agree with upping the damage of torpedoes or adding to-hit for them. On the WMG, I agree with SJ. I like the idea of a long-range sniping, but bulky, expensive and slow-firing, DR weapon.
Can't really say much about the other weapons since I haven't played with them.
The PD nerf seems a bit much though, considering the defensive bonuses PvK suggests to fighters and seekers. I do agree that PD to-hit should be reduced, but not to Proportions-levels

I think the nerf should be to fleet / ship training since that is where it is really unbalancing. It should be way harder to build and research those facilities. And of course, PvK's ideas about making racial combat bonuses way more expensive are good too.
And oh, I'd really like an increased range for Tractor Beams too, please. I want to be able to pull the pesky hard-to-hit, always stay at max-range ships in close to bLast them.
Finally, as SJ keeps reminding us, there other things besides combat in SEIV that need rebalancing too. Climate Control Facilities do need to work faster, facilities that improve production of one specific resource should be better than those that improve all three resources etc.
BTW, I take it that fighters / drones receive racial / cultural combat bonuses, but do seekers receive defensive bonuses from these factors?