We have the Taipan Veteran Standard in 177, 22, and 25. We are using the DonnyFL Shogun on all three. This is a backyard friendly air rifle, in all 3 calibers. You will not be disappointed with your choice.
Perhaps this will be of help- 1- check that the front sight has been installed correctly. 2- check that the rear sight is not damaged or missing parts. https://www.jgairguns.biz/717-and-722-c-78_186_224/dai717137-daisy-717-windage-screw-p-15675.html...
The only speed dialer I am aware of for the Taipan Vets is the one from Donny FL. Are there others? I am not sure I even need one, as I am happy with the performance of my Taipans Veteran Standards; as they are set up.