Downthrust will make it worse.....

Take the downthrust out if you want to solve the "Problem" some planes come with up to six degrees of downthrust but two is plenty, the idea is to make the plane climb under power.

You can take the downthrust out by adding washers to the front of the engine, but you might want to check it first to see where it is set in relation to the wing.

Hope this helps.