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You CANNOT get the extrinsics by merely decomposing the essential matrix. The translation vectors you get from recoverPose() are always unit vectors. "By decomposing E, you can only get the direction of the translation, so the function returns unit t.", from document of decomposeEssentialMat().
If you must calculate the extrinsics by essential matrix, one possible solution would be introducing the scale information of the real world, including using the aprilTag or adding an IMU to your system.
Besides, eight pairs of matched points might be not enough. Points on the same plane are not useful for essential matrix method, and the decomposeEssentialMat() would use RANSAC to eliminate some outliers. So try using more points correspondences.
It would be much easier to locate and solve your question, if you could post some detailed data of your work.
