You will have many opinions regarding this... Don't take the advice of... "This is normal..." becuase it isn't...
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I haven't read you experience level, I'm assuming you're just starting out. I'm also assuming you have a H9 Alpha 40 and opted for the 60 size 2- stroke Evolution 60NX...

First thing first to check, and check all...

1/4 inch at any throttle speed seems to be begging for in flight flutter which is a non-recoverable phenomina and will destroy the plan in flight if it occurs. If you used a 40, the risk is lower. But the 60 in this plane is well overpowered even though the Alpha is showing 40 in the specs. No problem with the 60 in the plane... Just less room for errors when flying at faster speeds.

Check the following:

1) Linkage should have minimal slop. If there is more than 1/32' slop at the contol surface, stop and fix the problem. Checked by moving the control surface with you finger.

2) Reeming the prop may have resulted in changing the center hole location causing an severe out of balance prop condition (Meaning center is no longer center). Ditch the prop and ream from the plane side of the prop with a proper size prop reamer.

3) Prop is out of balance. Less of a problem with a smaller prop. With the 60, everything is pronounced in this size plane. Most likely cause of vibration resulting in the appearance of control surface movement. Balance the prop by either sanding the plane side of the prop without taking much material. Not the tip of the prop. Or you could take clear finger nail polish in thin coats to the back side of the light side of the prop near the end of the blade.

Check and fix these three things and you problem should be significantly reduced.

With some vibration the illusion is the control surface will have a lot of slop. When the plane is in the air, there will be less vibration as there is no contact with the ground to reverberate back to the plane...

If anyone of the three things are an issue, fix them before flight. Seek assistance by a qualified pilot at a local RC field to pre-maiden check before attempting to fly...

Good luck...

Larry Diamond