I think you could go with the 101. I am using this board for up to 7.8 and it is working quite well. It is alot wider than the 90 that you have so it will go better up wind. If you are thinking you would use your 9.0 sail alot on the board then I would go with the 111. I think the 101 is a bit too small for the 9.0 and even on the 111 you will be pushing it with the 9.0 but it is doable.
Hope this helps.
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