I think despite what the elders book says most elders have a 'if in doubt lean on the side of mercy' mindset, but only according to incredibly harsh rules that have been set out for them.
For example suppose someone is on a judicial for the 2nd time, most elders will probably reason that the reproof failed last time so to them doubt is removed and they will likely df no matter how sorry the individual is.
A prominent elder on our circuit who has sat on many appeal committees once told me that in sexual matters (most jc's) the most important question was whether contraception was used and if so the outcome was very likely to be df.
Once again the org's rules don't leave much room for mercy.