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Kanban does not work with estimates. A task is picked up in order of priority, then worked on till complete
And kanban boards shouldn't have dozens of columns.
Ready, in progress, done (maybe an extra for resolved if you need a PO to look at it before done) should be all you need.
Off by only 20%? That sounds like a dream though!
How is it done if it's not tested? Testing should be included in being done. I'm assuming testing is then an afterthought? IMO testing should be integrated into development. Testers should be pairing with Devs.
The whole point of kanban is limiting WIP. Doing this actually leads to faster development as it's done right the first time