As for Heartseeker, a crafted L20 crit crossbow or L20 Speed/Max AP bow would be much better.(
Borderline better may be. I just crafted a level 19 bow with craft 5 and enhanced it the same way as the heartseeker. It was a bit worse, see below.
Heartseeker Lv 14 enhanced by a level 16 craft 5 character (telescope etc.): Raw damage 108 to 188 plus water 66 to 111. Crit Chance +8, strength +2, dexteritxy and perception +3, Bow +1.
Damage rating at ranger character: 250 - 432
Crafted bow (same enhancements, tenebrium enhancement overwritten with water) with a level 19 character craft 5: Raw damage 120 to 240, water 36 to 72. Crit Chance +11, strength +2, dexterity +3, perception +2.
Damage rating at ranger character: 222 - 442
Heartseeker borderline better. Very simple why: You can add more elemental damage as it already comes with some and the plus 1 Bow adds 10% to damage output equipped.
Note: If you rate the 3% better chance of the crafted bow for a crit as a factor, the relation may be borderline reversed.Regards,
Thorsten