As I said before, there are certainly some little tweaks you could make that would save you the odd byte here & there in your 1-Wire code, but that's just chicken-feed; you would be fiddling while Rome burns!

Your big problem is that your Code space (12K?) is 99.5% full!
You need to be looking to save several K bytes - not just the odd one or two!

You need to review the whole of your code for inefficiencies;
eg, each of your 1-Wire functions has several inline delay loops - could you not call a delay function instead? Would that help?

Look out for code like this:

if (!SDA4) status=1; else status=0;

which is really just

status = !SDA

Do you even need to invert it at all?

If this sort of thing is repeated throughout your code, there's probably lots of savigns to be had!

There have been several threads both here and on the Keil forum about writing optimum 'C'

Does your compiler have additional optimisation levels you could use?