Wow, 1/4 inch cut is big.
Usually only cut ~1/8 th. at a time. But anyway, you're still good with what you have on 40. Don't sweat it, you'll be just fine.
(now if you are trimming an antenna that you know is pretty long and does need to be shorten substantially, then 1/4 is okay. But if you're in the ball park, always go 1/8 or less.)