Good on you Rod, welcome to the BIG Dob club !
I am very impressed with our 18" F4.5 & was out observing with it till 2 am on Sat night
I have found with the F4.5 it is quite selective on the eyepieces it likes.
Best view was with a 40 mm 2" widefield, would love to get a 28mm TV panoptic, as I am told any focal length longer that this is not using the whole mirror !
A 40mm 1 1/4 possol was like looking through a drainpipe !