Had a chance to look at this and I will try to describe what is happening, atleast with mine
The boot catch is a plastic hook which clicks into place around the hoop on the catch mechanism. Once in place this clicks across and you can manually do this with your finger when the boot is open.
Alongside this is a flat metal 'contact area' and when you push it with your finger it releases the hook back to its open state. No problems there then.
When you yank the lever by the drivers seat or click on your remote release there is a striker that hits this contact plate and attempts to drive it far enough to activate the release for the hook.
In my case this is now taking one or two attempts before it moves the contact plate far enough to engage the hook release.
Where is the resistance coming from?
It appears to be coming from the two spring loaded rubber footed legs that protrude from beneath that hatch and attempt to permanently force the hatch skyward. The amount of pressure they generate times the amount of friction on the hook/hoop surface area is greater than the striking force of the remote release.
Quite impressive when you try to hold on to the remote release widget and see how much force it generates when you fire it!
Anyway, to cut a long story short, You can adjust the force of the spring loaded legs or you can reduce the friction in the mechansim wtih some kind of lubricant.
Hope this helps you out,