The 3x barlow that comes with the Ioptron scope is next to useless.
I use a GSO 2x barlow, while not of the highest quality, it does the job well enough.
I also suggest changing your finderscope. I've put a 9x50 right angle finder on mine little 80mm refractor and it makes the scope a joy to use now.
The diagonal isn't much chop either, if you can spare the cash, buy a mirror diagonal. You can get all of the above quite cheaply from
www.andrewscom.com.au.