Ceiling fan turns slowly

https://hamptonlightingadvice.com/hampton-bay-replacement-parts/

https://www.homedepot.com/b/Lighting-Ceiling-Fan-Parts-Ceiling-Fan-Blades/Hampton-Bay/N-5yc1vZbvneZp4

It is a Hampton Bay (or Savoy house) 55" - E81964

https://www.google.com/search?q=Hampton+Bay+%22E81964%22++52%22+blades&tbm=isch&ved=2ahUKEwjDuu_J65n1AhX-o3IEHYn9BSgQ2-cCegQIABAA&oq=Hampton+Bay+%22E81964%22++52%22+blades&gs_lcp=CgNpbWcQA1DrDVikN2D-PmgAcAB4AIABYIgBwgOSAQE1mAEAoAEBqgELZ3dzLXdpei1pbWfAAQE&sclient=img&ei=cyfVYYO1Jf7HytMPifuXwAI&bih=937&biw=1920&rlz=1C1QJDB_enCA643CA644&hl=en-GB

you are probably better off buying a matched weight set!

https://www.google.com/search?q=hampton+bay+ceiling+fan+replacement+blades

Manual for hampton bay ceiling fan E81964 - Fixya

https://www.fixya.com > Forum > Dryers > Hampton Bay
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Savoy House Ceiling Fan 52" Hg-1731 E81964 Tuscan ... - eBay

https://www.ebay.com > ... > Ceiling Fans
Find many great new & used options and get the best deals for Savoy House Ceiling Fan 52" Hg-1731 E81964 Tuscan No Blades Lights Lighting at the best online ...

Savoy House Ceiling Fan 52" HG-1731 E81964 Tuscan No ...

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SAVOY HOUSE CEILING Fan 52" HG-1731 E81964 Tuscan No Blades Lights Lighting - $279.99. FOR SALE! You're looking at a Savoy ... Light Kit by Hampton Bay. ..

Check this article it might help:
http://lightingworldbay.com/my-ceiling-fan-hums-but-blades-dont-spin/

Sounds like you have covered all the bases already, but there is the small possibility that it is the housing vibrating. You can remove it and buffer the adjoining parts with electrical tape on the inside (so as to be hidden). Otherwise, you have a fan that hums (many just do). May need to exchange for a known quiet model like a Hunter or Panasonic.
Farmerbear at FixYa.com

its not the bearings sounds like you need to level the mount and that scraping it the fan blade mounting plate hitting the side of the 'case' that surrounds the motor assembly ive never heard of bearings in the motor going or needing lubrication other than what factory placed in them...remember Hampton Bay is the Yugo of electric appliances too

Although we do deal with Hampton Bay fans ourselves, here's a link to someone who does:Contact Mike Evans
Website: www.eceilingfans.com
Phone: 979-553-3260

Ceiling Fan Parts & Service

This fan is also known as the Hampton Bay Covington 54 Ceiling Fan. You need to turn the globe anti clockwise until it comes out. The full instruction manual can be found here.
http://lightingworldbay.com/hampton-bay-covington-ceiling-fan-54-cvt-manual/
If you have another fan model other than the Hampton Bay 54CVT then try here
http://lightingworldbay.com/hampton-bay-ceiling-fan-manuals/

You need a new motor, are you still in warranty?

18 gauge is a little light... should use 14. Are you sure it is a hum, or is it possibly the fan resonating due to imbalance of the blades. Watch to see if the fan is oscillating when it runs. Also, does changing the speed affect the frequency of the hum. If this is the case, you have to balance the blades using metal shims.

It sounds like the fan motor has blown out. Is this an old fan? The motors do burn out every 5-10 years, depending on the brand and quality of motor.