I would suggest shooting it in more classically "pretty" light in order to make use of the film's most definitive characteristics. What you have here is not all that technically different than what Ektachrome or Fujichrome could do in that weather. I would also suggest using a painstaking technical approach (tripod, cable release, careful selection of shots, etc.) Not to knock you for sake of knocking someone, but to me, these pix look pretty bad in terms of subject, concept, light, and technical qualities. Aside from the fact that they are not aesthetically pleasing to me, the shots seem really random and uninteresting. They aren't about anything. They don't say anything. They aren't worth using K25 on, IMO. Go do the film some justice...or, rather, let it do justice to some of your work to which it is well suited. It's easy! All it takes is an eye for light, some thought, and some effort. You have three rolls left of what some will forever argue was the best film ever made. I suggest that you don't waste it on lame snapshots (unless that is somehow part of your concept in the project - lord knows more lame snapshots were probably taken on Kodakchrome than any other photographic imaging medium). I think that going in the direction of American icons and/or symbols would be a good start for ideas. The film itself was a U.S. icon, and this is the last of it that will ever be shot. I'd take that angle. I might also use it for a documentary project. Something about the economy, about unrealistic positive thinking and Reagan economics and what they have done to this nation, about poverty in our backyards, the death of the old ideas of what is American, etc. Kodakchrome - and all film - is just another casualty of rampant, unchecked, unregulated capitalism and consumerism that has defined the past two generations, and that has totally changed the idea of what it is to be American. I'd do something about that. Kodakchrome itself is a good metaphor for this, IMHO.
