i think you are entirely correct.
amp envelope on DN is a bit weird, especially big values.
i observe same behaviour: at max attack, sound gets to medium volume within 2 seconds, and then its a slow crawl to peak. which is a shame.
i can get desired attack by sacraficing LFO, but those are most valuable in sounds that ring out longest.
i dont know elektron will even consider changes to sound engine this late into device life, but i really hope so.
Please create a ticket for the support team, i will do the same.
And to anyone who has DN and wants slow pad sounds, please make one too! 
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