Cloudflare only helps with http/https last I checked. And I would rather not centralize yet another bitcoin related service behind Cloudflare.
As for the effectiveness of the attacks, the only noticeable effects lately have been slightly delayed response times with the web server. The pool servers have been generally unaffected.
The web server setup definitely is not as scalable as I would like, but that falls back to the mostly unfunded part of the problem.
I'll throw this out there one more time: I know my 1% isn't much given my tiny rig, but I'd be happy to donate some time to help out the cause. Scalability is a big part of my job.