With February 6th's launch of Falcon Heavy we saw the landing of both side boosters. During the past few weeks and again in the press conference today I've heard over and over about the increased difficulty in controlling these boosters for landing over a plain F9 mission. Specifically because they have nose-cones the aerodynamics are different and apparently the grid fins are only able to provide less control authority in that configuration. As a result the side boosters (but not the center one) got the upgraded Titanium fins with larger control surfaces to make up the difference.
My question is why go to all the trouble and expense of upgrading the grid fins to make up for poor aerodynamic profile? Why not just fix the profile? If the blunt end of the rocket as found on the Falcon 9 after stage separation is better, why not jettison the side booster nose cones after separation and before landing? It seems like that would be a relatively chap and easy part to just ditch.