I have this problem too but on the passenger side.. I think Ben (dreaminaccord) did this too with Bosch wipers. He switched to OEM and problem gone as well.
Did you port match the runners to the gasket? Was there any overlap on the intake ports on the head. Sometimes if there is an edge it can create turbulence and hurt power.
Yes sir! Gasket matched and pretty dang close to the head match. The intake ports on the head are ever so slightly larger than the runners. I plan on going in later and matching up the head and fine polish the runners for even better flow. The only reason I hadn't done that to this set was I was under time constraints to get it finished. Dang college life.
You and me both I already had the TSX IM on for over a year. Then last fall found a deal on the TSX throttle body. So I think the combo has helped a lot. But yes I agree I'd love to get some dyno runs in but just wish it was a standard. .
After letting the ECU get used to the new mods here's another video.
So I have ported two sets of runners. The first being from a TSX (which will not work on our accords) The second being the OEM runners that were on my CM5
The TSX runners I ported out to 2-1/8'' where the stock diameter was just under 2". Doesn't seem like a lot but There were definitely noticable gains.
Now the reason the TSX runners/inj base will NOT work on the Accords is because the TSX does not recycle the exhaust gases through the runners like the Accord does. There are only four small ports in the runners on the TSX set. On the Accord however for "maximum efficiency" the exhaust gases are dumped into the runners via four large ports right at the top of the runners where it connects to the intake manifold. I think the TSX doesn't have these because they have Vtec on the exhaust side so they just dump it. Because when i blow into the hole that should be where the EGR gases flow through its blocked somewhere internally. On the accords it's free flowing.
Anyways So since i threw a CEL for "Exhaust gas recirculation insufficient" I went ahead and ported out the OEM set from my car.
These I ported out to 2-3/8" which was significantly larger than the stock size. I have these paired along with Ralco Stock Diameter lightweight pulleys, TSX IM, TB, and weapon-R secret weapon intake. Love the results! booty dyno definitely likes it and the engine literally ROARS when vtec engages.
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The intake ports on the head are ever so slightly larger than the runners. I plan on going in later and matching up the head and fine polish the runners for even better flow. The only reason I hadn't done that to this set was I was under time constraints to get it finished. Dang college life. 
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made it for everyone 
<-- me --> Oklahoma 