Think you've answered your own question mate - there's probably summat wrong with the Collins. It'll be a weak spring at a guess. You can replace it with a stronger spring, if you get in touch with Collins they'll be able to advise you.
Regarding Baileys, people have tried them - I personally have not. I have heard them, don't think they're as good as a Collins, but that is only my opinion, others prefer the Baileys noise... it's horses for courses..
Matt.