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You could do either higher rate springs or longer springs. If you are happy with the spring rate as is, go for a longer spring with the same rate. The spring rate may be labeled on the spring you have. Others on this board may be able to help recommending rates.
If you measure the spring dimensions (i.d., free length) you can find replacements on-line. You may be able to get free length by unloading the coil and screwing down the perch as far as it will go. Doing that will also give you the approximate length of the new spring you need.
Mike
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