That’s not necessarily how the decibel scale works. Its log based not linear so every 10 dB increase is a magnitude increase (x10) in sound intensity. That means that the noise your ear perceives roughly doubles every 10 dB. Because of this, a change 50dB to 56dB is much less than a change of 112 to 118. For comparison 110 dB to 120 dB is like going from a stock car horn to front row at a rock concert.The short version is that those Hellas require more power than the OEM relay supplies, apparently. I don't know why it needs so much more power especially as there's only 6db difference between them and PIAAs. That's a db value difference less than the "volume" of normal human breathing.
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