G'day Cristiano, nice collection of goodies!
I think Baader "semi-apo" filter is the best bet, however I don't have experience with that. At CN refractor forum people saying this is the filter which has the minimum colour shift effect.
Regard of chromacor, I think the economy of the achro diminish rapidly
because of the expense of the corrector. On top of that you really need to evaluate the spherical aberration to get the correct conjugate.
If you find your achro has a zonal error, the chromacor is not correcting for that.
If you want to make it sharper, and you brave enough to thinker,
the Fraunhofer doublet can be optimised by changing the gap between the elements. This is the most crucial for spherical aberration, and if you optimise it with the green filter the reward is well worth it. Again it must have a smooth figure!! If it has a zonal error or astigmatism just live it as it is, and use it for low power wide field.
Cheers,
Mick.