Hi Steve
Aside a strange recuring theme of buying short focal length orthos and selling them at a loss because of poor eye relief
I use a similar spread in my 12" and find the 3 work well enough
the 8.5xf I've never thought to sell as its such a good little ting
I am quite liking a 32 tv plossl atm to.
I guess the pentax barlows alright ?
graham