It's not the weight of the boat, or whatever it is that you are towing. It's about two things; how much weight is on your towball and how level the trailer is when your are hitched up.
Ideally you want the drawbar of the trailer level, particularly if it is a dual axle trailer. This will stop excess load being placed on the towball. The static load on your towball should be less than 60kg generally speaking (and preferably not less than 20kg or you may get a tendency to trailer sway).
If you follow these general "rules" it won't make any difference what springs you have. As long as they aren't from the @rse end of a HQ that is! LOL.
PS. If, after fitting lowered springs you find the drawbar of the trailer slopes down to the towball when hitched, then you have to raise the effective level of your goosneck/towball to compensate. There are various styles of goosenecks with different angles (rise or fall from the mounting point) to allow this type of compensation.
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