i tend to ignore the numbers and just look for the high or better rate. With finding high for tin i have always found tin but using the other mode for the pick is key. You will find it in that chunk but it may not be easy. My method for searching is setting node search at 6 and doing a straight down hole 2x1 every 7 blocks i do a node search. Then if you find some you know it is below and not above you.
If you are unsure of the node search mode this is the command for it.
/worldConfig propickNodeSearchRadius 6
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assassin_chad_23's post in How many ore nodes per prospected chunk are there? For tin/zinc etc was marked as the answer