Give the type-1 heavy another low slot and keep the type-2 heavy the same but give it an equipment slot.

I know this is not detailed but if you're an experienced player you should know how these changes could help the heavies with out making them too powerful.

EDIT: We should get active shield boosters and armor repairers. This would really help heavies and other suits too. The armor repairer should be a low slot and the shield booster a high slot. Altho it would be more balanced if the shield booster was a low slot too. Your thoughts?

Uh ? No.
The whole point of heavies is that they focus on tanking and gunning at the expense of less fitting options and NO equipment slot.

TBH fatsuits need more lows for application of better armor tanks, be it through plates, reps or both. Bluntly Id cap an amarr heavy at 1 high, but give em 3 lows and take away the nade slot.

No to adding equipment. heavies are supposed to be team-dependent. bring a logibro.

I was a bit iffy on the equipment slot too but how can we tank without the proper mods? I don't think you relise how easy it is to blow through your armor and shield as a heavy. Most peoples comeback to that is get a good team/squad. Well, think about this. If you barely make it out of a fight alone, if at all, what diffrence would a team make? all you would be doing is holding them back. If your saying that heavies should be a bulliet sponge then why would you spec into them. All they would be good for is taking damage then dieing. If you say heavy weapons make up for it you are wrong. HMGs are only really effective at close/slightly medium range. Without spending a ton of sp the get them somewhat good they are really ineffective.

Giveing them a bit more breathing room when it comes to mods might make them worth the price and a bit more effective and appealing to use.