So I called and talked to Bob last week, This great debate may have been solved. there is no exact answer to which is better, or which is better, natural or man made stuff.
After a long conversation, Bob asked me how long it would take to fish all the structure in my lake.. the answer is 3-4 hours...
So it is OK to concentrate the fish to 25% structure if you are ok with the time to fish it... if your lake is 10 acres, maybe more strategic placement would be needed, but in a smaller, 3.5 acre, my amount of structure might be appropriate, depending on your goals.
I have gotten 4 more foot of run-off, and the above cinder blocks are in the water.. i saw fatheads swimming all around those blocks... 1 point for man made...
Thanks for all the help!
dustin