This type of plane won't just mush in like you want. Try adding power as the elevator input is applied. Sounds like it is slowing up good though.

Take it up to a good altitude and play with it at different power settings, and elevator input, maybe your adding just a tad to much elevator, The plane I sold will be around the next week or two I believe, if I see it flying I will have him slow it up to look for some type of snap tendency.
V-Snap