Thank you for many replies.
I can understand following opinion. I think it may be right from audience's view.
Herc family must be bulky. Hamano's Herc3 looks non-Bulky. It will not be a Herc family.
However, let me write some my thought from creator's side.
When I developped my herc3, I planned to reduce weak points of Herc2 and give someting changed.
Low speed and less guns are Herc2's weakpoints, so I increased speed and guns in Herc3.
However, only increasing makes invulnerable fighter.
I decided to make some weakpoints for gaming balance.
Missile capacity is reduced from this, but still 160% of Erinyes.
It is reduced but still high, I think Herc3 is in heavy assault category.
For exterior, Herc is boxy, Herc2 is roundy, Herc3 has edges, they all are different.
Herc2 already has Ares as a variation, so I decided to make a big difference between Herc2 and Herc3.
I hope that you feel some technical progress for difference between shapes of Herc2 and Herc3.
One more thing.
I have developped my Herc3 as advanced Ares, based on the design of Ares.
Herc3 looks non-bulky, but basic design of Herc3 is the same as Ares.

According to this, I think that my Herc3 can be placed in position of a direct descendant of Herc2 and Ares.
After seeing this comparison, you may feel Herc3 more hercy.(^_^)