Monster Ovals.Probe insertion.PCV Map22

[Potato Man]

Current setup: 09 FLHR, Monster Ovals, PCV with Map22, K&N Intake Kit

Hello Folks.

I have an issue regarding the proper dyno A/F probe insertion with my Monster Ovals. Here's the skinny.
I put my ride on a local dyno that is brand new to them. So they are not all that experienced. A few runs tuning the PCV revealed a lean condition above 3500rpm that required adding fuel. A lot of fuel IMO. I left the place with a reasonable A/F curve; but still high and shaky (14-15 from 3500-5500). Here are the power results.

Stock
HP= 63.2
TQ= 73.4

After Monster Ovals, PCV with Map22, K&N Intake, and dyno tuning
HP= 72.8
TQ= 84.4

Not too bad here. Although I thought I would gain more.
I think that the A/F being lean may be due to improper probe insertion in the Monster Ovals. There is a solid baffle about 4 inches from the end. The probe was secured at an angle to get in contact with the exhaust gases coming from the perimeter baffle material. This doesn't seem right IMO. Four inches of insertion doesn't seem like enough. I have read that the A/F probe should be inserted as deep as possible; the deeper the better. If this is true then maybe my lean condition was a false reading due to the poorly placed A/F probe, and we tuned in more fuel unneccessarily.

Any ideas on this theory?
I have also read about drilling out baffle plates to allow for proper probe insertion , and then installing plugs in the holes after. Is this a good idea ? Also, I wonder if just the base map22 is good as is. If so, I could reload the stock map22 and forget tuning it, AND no drilling out the exhaust.

[nvsteve]

You may be correct in improper readings because of the probe insertion. My last 2 bikes the tuners drilled about a 5/16" hole in the baffle. Different tuners so I would guess that this is the most common practice.
My numbers on a stage 1 96" are 75hp/88tq with a PC111, ovals, and K&N. I consider mine average.

[Potato Man]

nvsteve,
Your numbers are higher than what I got. From what I have read, dynos and dyno operators are not created equal. All these years later you would think that a dyno 'standard' would be in place so the numbers would relate. I'm somewhat satisfied with the gains, but MORE is allways better.

I am still concerned about the A/F ratio after dyno tuning. I still don't know if the dynojet map22 is really good as is. DYNOJET hasn't returned my email regarding whether or not tuning this map is neccessary.