We have this problem when anchoring out anywhere in the lower Columbia, where the anchorage is exposed to current. Our current runs about 1 to 2 kts most of the year but about 3 for a couple months during spring runoff... like is now - just finishing.
Some years ago, we were anchored behind an island with our prior fin keel boat, and woke up sideways to the current. The line was around our fin keel, when tide reversed in the night. I guessed right - and backed around the line in the proper direction to unwind us.
Wing keel shape would be worse, followed by a fin-n-bulb shape, followed by a deeper fin.......
You have a LOT of current, imho.
A 'sentinel' would help, altho having the heavier chain normally puts enough vertical in the catenary to avoid such a problem. Usually.
Your setup is (?) a rope pennant to a permanent float, then all chain down to the weight on the bottom?
It would be Interesting to find out how your neighbors deal with this.
Five knots is a LOT of current.
Keep us posted.