That is actually not true 
If you checked my post here, you’ll see that adding an advanced blunted fitting can raise concussive damage by as much as 60 on heavy attacks (and 30 on light ones), so way way way beyond 32
That means that yes, a Lovetap with an advanced fitting does 80 concussive damage on heavy attacks, if you run a full authority build, 20 points adding 6% each… that goes up to 176 per heavy hit… and given the move-set of the weapon it becomes the best knockout weapon even now since it can hit everyone around you, heavy finisher does aoe knockdown plus the weapon provides hyper armor on every swing not to mention that despite having slightly lower concussive damage than most, some of the hits in the moveset do 2 hits (heavy opener, heavy finisher) that more than makes up for any difference with the added bonuses mentioned above 