Hi,
I don't think I have replied on your thread before. I went back to your earlier thread to access your spreadsheet. We need to help you attach it to your signature so it comes up each time you post, updated.
Your recent curve is great information and, unfortunately, completely typical of Canninsulin, with an early nadir and then a short cycle. Increasing the dose a little is a possibility (the nadir wasn't so low that going a little lower wouldn't hurt) but that may just add to the bounce he is probably getting and it is unlikely to lengthen the cycle. It is probably worth a try, but it may not help much.
Have you approached your vet about a different insulin? You have been on Canninsulin awhile with no great progress. In the UK, my understanding is that you have to try Canninsulin first, but if it doesn't work, your vet can prescribe something else. Several UK users here have been able to get Lantus or the European version of PZI.
To attach your spreadsheet, highlight the url on it and copy it. Then go back to the Control Panel, and choose Signature. Once there, paste that long url into the white box. Highlight it again and go up to the top of the box and choose the URL button. That will make it readable to us. Then choose Submit.