It is so very hard when you feel you have to not only advocate, but work it all out for yourself and then fight! He is probably right, that over the past 25 years he has sent PALS for pegs with low FVC because the RIG is becoming increasingly the first option for PALS. But it hasn't always been that way.
Some doctors will continue what they have always done because they have always done it, while others will try to keep up to date with the latest research and findings and practice continuous improvement.
Amidst it all you need to remember that you are the best wife in the world, but you are not god and are battling uphill in these situations and cannot produce miracles every time. I know you, like our other CALS have actually produced some miracles at times, but you can only do so much. Believe me I tried to produce all amount of miracles too.
I hope you can find someone to refer you to an IR so you can make the best informed choice.
Chris's MIP and MEP was at 30 about 4 months before his peg procedure and he never had a bipap. We do know that there is a far higher success rate being reported on the RIG, so if I had Chris here now and a choice I would suggest he try a RIG. At the time, only 3 years ago I didn't even know about such thing as a RIG!