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personally I do not send my sp anywhere, I keep all I get
I do not delegate much but I do sell my spare voting power (which brings less then delegating but allows me to keep my SP) if you are really interested i have an article about how to do that here

Yes, I sell my vote to minnowbooster and smartsteem. Where do you sell yours?

They offer 95% of returns on a daily basis, but they are quite large, hence the APR is actually less than 38.5% imo.

N.B. 95% of prorated round returns does not equal to 95% APR!

Interesting, it seems like 38% APR is the best return that can be found. You, brupvoter, and jerrybanfield all offer about 38%