Coldheart has an intrinsic Target Lock perk that makes it better than any other Trace Rifle in my opinion.
In fact for Arc builds it is a natural pick as it generates insane amounts of Ionic Traces, I rarely put it down for the whole of last year as all of my abilities and super were constantly recharged.
I could agree with it getting a buff to damage, but Legendary Trace Rifles need it as well if not more, though they could stay where they are at and swap to Primary ammunition. The Exotic ones are fine with Special.
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A bold ending heavy burst hand cannon does more damage then cold heart so id say the cold heart needs either more reserves or primary ammo over how it's the pinnacle of omolon tech