I THINK I HAVE THE ANSWER!!!
1st gear on the TSX is too short. Normally... redlining say a Civic Si (b16) in first gear, 2nd falls right at the VTEC changeover point. So theres a constant pull after gear changes. However, the RPMS on the TSX falls way below the 6,000 RPM VTEC changeover point which accounts for the "BOG" that you feel. It feels like theres a slight or momentary "loss" of power between 1st and 2nd. But as the revs begin to rise again in 2nd gear... your back in business. I've noticed this alot with my car... theres really nothing we can do about it. Except maybe engine mods or RSX TypeS tranny swap.