I don't frequent the projector forums, so I was pleased to find out recently about people using a filter like a CC20R to help compensate for a run out on the color red on digital projectors. I'm very interested in trying this out on my Sony 70XBR2 SXRD RPTV. I have some questions about doing this. Other then the obvious problem of physically installing this filter in a RPTV, I have a few questions:

1) What level of correction filter would be appropriate for my HDTV. I've seen the CC20R, CC30R and CC40R mentioned. Currently I have my green drive set at 128 and my red drive is set at 152 in the service menu (obviously this would only mean something to someone that has calibrated my particular TV in the field). This seems like a large disparity, but I'm unsure how dark to go on the filter.

2) What kind of compensations will have to be made in the TVs service menu. I realize that the grayscale will shift significantly towards red, but will it be necessary to adjust my color decoder (which is easily done at any rate)?

3) I've seen it mentioned that using a correction filter will "pull in" the color of the blue and green primaries (and possibly shift red to some significant degree?). This wouldn't seem like a problem for green on my TV since it's significantly outside the color triangle, but my blue is sitting just off it's correct point. Would this cause blue to shift inside the color triangle? And if so, would it be significant enough to be a deterrent for doing this?

4) Why type/brand of filter should I purchase. A Kodak gel wratten type filter? I'm on a very tight budget at the moment, so good alternatives that are affordable would be helpful. If necessary I can spend some decent money down the line on something better if a cheaper solution doesn't pan out at the moment.

5) Any other pros/cons that I haven't brought up.

Thanks in advance

I don't believe a red filter will get you what you want. It's not unusual for a calibrated SXRD to have the green drive 30-40 notches lower than the red, which is factory default at 128.
If the filter did lower green and blue to match red, it would be lowering overall light output of the other colors to match the red. You may have lower black levels, but that's it; otherwise your set's dynamic range would remain the same. I'm not sure if even the lower black levels would remain after recalibration to compensate for the filter.
The filter would pull in the green and blue primaries, as you said, but it would make the red primary even wider. I don't know to what extent because I've never had occasion to measure that. But I don't think the subjective color accuracy of a gamut with a WAY wide red, accurate green, and accurate or slightly narrow blue would be very pleasant. It shouldn't effect the color decoder; just the grayscale and color gamut.