nat19, you may in fact need to lengthen your radiator, but how do you really know that is what you need to do? You don't! You're likely just chasing your tail trying to fix this. My best advice is to slow down a bit. You have to be guessing, based on the results above.
You've told us for a week now that you're seeing different SWR readings and so far that is all over the place, not good. Admittedly the rain may have something to do with those variations and has to be considered, but you seem to have had problems before the rain.
You need to take a serious look at the construction and then the tune of your antenna, because the bandwidth should not be acting like you describe.
The length of the V58 is an important dimension, but when using the Manual it is also important that that dimension be considered correctly and between the right two points. I have heard guys argue as to what is the right point to use at the bottom.
Tell me if you can, what were the points you used to measure between, for the overall length @ 27 mhz? My manual shows to be 240" inches for CB?
This antenna gives two ways to mount. Have you read and do you fully understand the directions and warnings for the bottom construction noted in Detail 2D Mast Mounting on my page #5 for BA1P? Look at the Base Assembly described on page #4, and the warning on my page #3 next to the Frequency to Length Chart? There is a possibility for confusion in those words and images. I'm not sure, but you have to know where the bottom is that they describe.
Do you know where the bottom is?
How say you?
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So basically the antenna should be around 240" to for use on 11 meters. Also once I get it tuned properly how broadbanded will it be. Would I be able to use it in the 11 meter freeband area without a tuner? I have always used it on just 11 meters before so I'm not sure.