Track Coaches -- Jumping Help?

I'm a high school student, been in track for 3 years, and I do both the triple ( 39 ft. 3 in.) and the long jump (17 ft 10 in). My coaches say that when I jump I dont get very high in the air. I think the problem is with my spikes rather than leg strength. I've been using running spikes (Saucony Crescent Sprint) and I noticed that when I take off, especially in the 2nd and 3rd phase of the triple jump, my leg kinda "buckles" when I land to do the hop, skip, etc.... My spikes dont have any heel padding to them, and i think this might be the cause. Therefore, I recently bought puma jumping spikes that have the extended spike plate, more spikes, and extra cushion on the heel. Will they help my jumping improve, as in more distance and height in the air? Thanks in advance.