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Brad points for hook holes.
Forstner bits for eye holes.
Here is the sim ple explaination for why you had the problem; Regular drill bits are designed to cut the bottom surface of the hole only. They leave the side walls of the hole as a by-product.
Forstner bits are ground to cut the bottom of the hole and the sides at the same time.
It's a simple thing, use the correct tool to do the job.
If you go to Lowes to buy them look at the Forstners that are individually packed and made by Freud. They go for around $8 each but you only buy the sizes you need. They are a much better tool than the ones you find in the sets.
Good luck.
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Threaded Mode