Quick catch mechanism question

Ok, so I've recently upgraded my Longshot to a ~6.5-8kg spring. To handle the increase in spring power, I added two extra springs to the stock catch. It catches fine, but I am encountering what may or may not be an issue. So the prime weight is fine, but when I get to the last cm or draw stroke, I kind of have to force it back with some more pressure. I'm assuming this is because of the extra catch springs, causing more downwards force. Thus me having to force it back more. Is this normal for blasters with a stronger catch? Also, will this eventually break the stock catch mechanism?

Thanks
Bubba