I was able to talk to my Service adviser over the phone about the slow acceleration response after the ECU reflash and here's how it went.

ME: Update ko lang kyo about the knock issue with my Accent unit... i don't have the knocking sound anymore after the ECU reset last Monday pero sobrang bagal ng hatak specially from a complete stop and pag paakyat.

SA: Ganun ba sir? humina rin ba aircon nyo??? (alam na alam ah...)

ME: Oo dati pwede na saken 1 lang blower with thermostat at 3/4 pero ngyn i have to put it at 2. Tsaka ung fuel consumption ko e hindi acceptable 7.5 - 8 KM/L (considering na off hours ung office ko 2PM - 11PM at EDSA ang daan ko 90% ng byahe)

SA: (...moments of silence..... ) hmmm.... dalhin nyo na lang dito sir bukas para matignan.

ME: Ok cge dalhin ko jan bukas.. pero pag dinala ko ba jan bukas may solution kayo?

SA: (...moments of silence.....) Sir wala pa po e.. wala pa po advise samen tungkol sa on-going issue ng Accent.. (Paktay tyo jan! )

ME: so wala rn palang ggawin sa unit ko bukas??? cge ddalhin ko na rn bukas para makausap ko na rn kyo about this issue.

THE END!