So two quick background concepts:
Personally, I am more comfortable with the concept of “likelies” rather than “safeties” (at least outside of college that have fixed qualification standards that you know you will meet). The good news is that whether a college is a solid likely for you is not really a direct function of their generic acceptance rate, as your profile can potentially put you on the high side of the admit pool for many great colleges, and in that position you personally will probably have a significantly higher chance of admission than their generic acceptance rate. And in fact, generic acceptance rates are in part a function of regional application patterns and other things that do not necessarily factor into actual selectivity.
Second, there is obviously a rather large selectivity range between Brown and Lewis & Clark, and so I think you could reasonably be considering not just solid likelies but also solid “targets” to fill in that gap. A good combination of solid likelies and targets would potentially serve you well, and indeed whether a given college was technically a target or a likely for you would not necessarily be all that important as long as collectively you had a good range of schools.
Combining these thoughts, in your position, assuming you took rigorous courses and such, I would think anywhere your SAT/ACT put you above their reported 75th percentile might be at least a solid target, possibly even a likely, even if their raw acceptance rate was under 30%.
OK, so a few schools I think you might look at include Rochester (1520/34), Richmond (1500/NA), Macalaster (1490/34), and Rhodes (1450/32). The numbers in parens are their 75th SAT/ACT from their latest Common Data Set. The first three or so of those are maybe more targets than likelies, but again all should fall well into the selectivity range below Brown but above Lewis & Clark, and could potentially fit what you said you are looking for.
Of course there are many such schools, but I also know all those schools have fairly robust merit aid programs in addition to needs-based aid.