ok here's the deal.
Firstly, I've found out that if I do /cs set mlock #channame +modes, (the modes won't stick). if I do just /cs set mmlock +modes, they stick. I firstly set /mode #channame +s and then did, /cs set mlock +stO, then I did what was said earlier to deny the channel in the config, but also re-directed to another channel so things are fine.