Your PSA is about 1% of what it was pre surgery. It was fully nerve sparing, presumably the surgeon could see no cancer near the nerves and hence did not cut out aggressively close to the nerves as a result. You probably have prostate cells in that area still producing PSA. The big question is are they healthy or cancerous prostate cells in that area? With a rising PSA, we probably have to lean towards, yes they are cancerous. These are very small numbers and as Adrian has just said slight errors in tiny numbers look like big changes.
If an oncologist saw your figures I am pretty certain he would say "let's do another test in 3 months and see if anything is happening". I very much doubt he would order any tests or scans at the moment as, if you have cancerous cells, they will be too few and small to show up on a scan yet.
On balance I would say, stick with the surgeon until you have got something which is officially classed as recurrence (0.2 or three rises above 0.1) . That way when you do get a referral (if ever) everyone will be singing from the same hymn sheet.
Remember I'm a random guy on the internet, doctors are better at making these decisions than me.