Your statements are all correct. Yes the net is 1.6% on 2 engine a/c and yes it clears obstacles by 35ft
Yet many confuse the net with the gross
Gross is what the a/c will fly actual on one engine and net is the penalty where the obstacle limitations apply for the 35ft clearance
That means that the actual path of the aircraft (gross) will diverge by 0.8% for all the takeoff profile by the obstacles (in opposition with ppl which believe that the actual a/c will have 35ft clearance only for all the takeoff profile)
Also an obstacle limited takeoff (penetration of -0.8% and failure to maintain adequate clearance) will have to be mitigated with improved climb by the software which will generate increased V2 to achieve the required increased gross gradient which obviously will be more than 2,4%