30 pound might be a hair too thin. I always use 40 and 50 pound Suffix 832 and I never have any problems (I own 2 ci4's). Do you have mono backing? Is the spool properly filled? I have noticed this issue some whenever I started getting low on line.
How many of the brakes do you have on inside? I normally run with 2 on, 2 off and the fine adjustment on 1.5 to 3. On a windy day with spinnerbaits and buzzbaits, I'll go 3 on, 1 off. Having the 3 on, 1 off setting will cut down your casting distance, but it will basically eliminate the backlashes on any of the new SVS reels (ci4, Curado I).