I don't think the rail and extra quarter inch adds 10 oz. I had both the old and new, and they both weighed 33. The new had the rail, but with the contoured slide it weighed the same.
Carrying IWB is even easier than OWB. Like you said, with the right belt and holster, it's not a problem.
bluestringer
Better check your scale, the Match w/ Rail I had in 9mm w/ an empty mag inserted came in overweight for IDPA ESP (43oz is the limit... the one's w/o the rail just squeak by).
Don't see how that is possible. The standard steel that I have weighs 33 oz. with the rail. The only difference in it and the Match is a quarter inch more length. I could see it being around 37-38 maybe but not 43. The Limited, Pro, and Gold Team are listed around 40-44.
Nothing wrong with my scale. The specs also say 33.
bluestringer