Folks, have posted about Ubbe a bit recently and wasnt sure whether to put this in here or the kveik thread, but since what I am about to post involves lauding yet more praise on the helpfulness of the CML lads I went for here. I emailed them re my Ubbe lager. Specifically that I felt it to be quite estery tasting and whilst it's still pretty good, it's probably smack bang between ale and lager. Anyway, they chased this up with WHC labs who said the following, which hopefully is of use to someone else too.....
Hi Guys,
Temp profile looks good, you can reduce the temp down to try and make it cleaner. We have made a good few lagers with commercial breweries at 35 degrees and they have been really clean.
One thing you can look at is your nutrients, kveik yeast need a lot more dosed nutrients then regular yeasts. If the wort had a lower amount of nutrients it might have inadvertently stressed the yeast. A small bit of stress could produce a low level of esters which you are describing. Regarding faux lagers in general with this yeast, you can look at increasing the mash pH which will increase the final pH and make the beer a bit more crispier and lager like.
Hopefully some of those tips might help.