HONDA produce excellent but sensitive cars. I had Honda city 1.3 in 2010 and now Honda City Aspire 1.5 2016 , I faced same knocking and loosing acceleration issues specially in 2nd Gear .
Honda City 1.5 has less of these issues.
I fixed 90% of these issues by using MOBIL 1 0W40 EXTENDED LIFE & HI-OCTANE ( PSO ). Indescribable difference !
TRY IT and start loving your Car . Don't forget to say thank you !
WOA , Usman