Hi Ben,
first of all, when you get an error, please zip log and lasterror.mat files and attach the zip archive here.
Secondly, there exist no “SBAS” processing in sarproz. However, you can choose processing options that can make something similar.
You do not need to process a FULL graph, you may want to process only a subset of interferograms.
Moreover, it’s your choice whether to use weights or not use them.
Finally, if you want to do something SBAS-like, you may want to unwrap your interferograms (how are you filtering them, are you multilooking and so on?).
The other choices are relative to the connections processing: which spatial graph did you generate? which model do you want to use for the movement? which range of parameters are you going to estimate?
All the set of options you choose will determine your analysis and the corresponding result. To give you suggestions, we would need to see your data (reflectivity, interferograms and so on)