Overbuffing multiple sections at once is very rarely a good idea. I agree with maybe increasing their accuracy, but I'd much rather wait for the shield buff to get a response to gauge the HVY effectiveness (damage is not the only measure of worth).
Okay, so... we're doing this. Anyone who doesn't care about fighting games can skip to the end of the segment. In DBFZ, you utilize multiple characters in a tag team of 3. This is commonly referred to as Point (primary meterless char), Mid (2nd or auxiliary character) and Anchor (heaviest meter eating character). Frieza is typically the latter and pops off with meter (though there are better chars, most of the dlc roster). And no, you don't have to even play as golden frieza to get golden... you just have to build meter on your other chars and get a hard knockdown into install.
Similar to the different equipment a trooper's kit might have (DC-15a, Z-6 Rotary, shield if given) you do not use only one part but all these parts in conjunction to measure the worth. Your analogy is that because an aspect of a kit is really good, you need to buff the worse off aspects to compete.
Subjective
In a game with not great hit registration, latency, etc it is really hard to keep a weapon about pumping out as much firepower as possible relevant with a damage scaling as well as keeping it relevant in the overall metagame of the weapons. If we buff Z-6 damage and it turns out stronger than the ARF sniper in DPS, do we buff that next? Do we buff the SUP shotty in response to that? Also if you can't hit things at point blank then that sounds like a genuine skill issue.