Defined benefit plan

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Sorry if I've missed a thread that would answer my question.
I'm trying (as is everyone else) to shelter more money from taxes. I'm a physician who works as an independent contractor (S-corp with me as my only employee) . I'm 33 yrs old and I max out my SEP at ~$45,000 and save an additional $55,000 in tax friendly mutual funds per year. Clearly this extra 55k is not truly sheltered. I've talked to some advisors who say that a defined benefit plan would work well for me, but from what I've researched I think I may actually be a bit too young for this strategy to work well. I don't think an allowed contribution would be very high (although theoretically the max is 180k per year) for a person my age. To be honest I never feel I am getting unbiased opinions from 'financial specialist' as they obviously have something to gain by setting this up, but I've had a difficult time finding sources to adequately explain this plan. You guys are always very candid and unbiased and I'd appreciate any advice you can offer. Sorry for the length of this post.