Glad to know it wasn't my imagination this time
With respect to the chances of hacking, they seem rather reasonable to me right now, except for level-2/3 fabs. Even with 2 advanced hacking suites, you don't have much chance to build a high-level part.
Currently, level-1 machines are pretty much always better than higher level machines, unless you're a hacking god. Then you either don't care or want the faster build times on fabs (but tracing is still a problem). That is especially true for terminals where level-1 indirect hacks are still better than level-3 direct hacks. Since you intend level 2-3 machines to be generally useless to everyone but a great hacker, I guess that means your design is working well
Generally hacking suites are much better than system shields. It sometimes causes problems when all you get are system shields from operators, but it's a minor issue.
I've been thinking about what could be done to make hacking viable for a combat build. Unfortunately it's not easy. I would favor reducing the coverage of hackware from 2 to 1, but it still doesn't solve the fundamental issue. Over time all your hackware is going to be shot off if they have a non-zero coverage value (flak cannons are especially nasty), and it usually doesn't take long. But if you reduce coverage to zero, it'll become overpowered.
I toyed with the idea of equipping
nothing but hackware, and using improved utility shields to protect it. That's a rather extreme and limiting option, though. Equipping any high-coverage utilities like sensors, armors, storage units render the shield useless.
With that said, I'm off to try that melee build. It seems a rather bonker concept since melee is slow and you get only one attack. Even if you do 3 million damage per hit, most of the time you will still hit some non-core part and waste your attack with anything but a spear. Spear gives you +33% chance to hit the core, so I guess that's about 60% chance to hit the core. With microactuators and melee analysis suites there might be a way to make something work.