Its all luck, I got a purple mark 5 ship regenerative shield thats got (cap x 2) and (reg) so going by memory thats almost 6k plus extra regen something like 206 every 6 seconds, every mark 6 shield I found since comes no where close and I suspect alot of the 7 and 8 wont either lol.
You are not alone. My cap extended mark 6 was still better than anything I could find in t4 and is only slightly improved upon by the rare exploration badge t5 unit. The other slots don't seem to have the same epicness.
Maybe the loot is designed the way it is so that it doesn't become grossly overvalued in determining just what you can/can't do. As the system stands now new T5s won't match long established T5's but at least they will be able to hold their own in both PvE and PvP.