Theres actually no issues at all with a 2 inch barlow lens...its even better than a 1.25" one.
I have 2 dual-barrel eyepieces. A Meade 14mm UWA and also a Meade 8.8mm UWA. With the 2 inch GSO barlow I can get 6 magnifications out of the 2 eyepieces and the barlow.
14mm UWA = 112x / 45'
14mm UWA (with the 2 inch skirt in the 2 inch barlow) = 217x / 23'
14mm UWA (with the 1.25" part in the 1.25" adapter of barlow) = 258x / 14.5'
8.8mm UWA = 174x / 29'
8.8mm UWA (with the 2 inch skirt in the 2 inch barlow) = 320x / 16'
8.8mm UWA (with the 1.25" part in the 1.25" adapter of barlow) = 380x / 13.25'
Then with a 2 inch eyepiece ill be getting the equivalent of two more eyepieces....which will bring the total to the equivalent of having 8 eyepieces!!!
as far as balance issues go, i have no problems at all because I use a counterweight bag on the back of the telescope tube , along with a couple of magnets.
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Mark
12" Gso Scope