New Cheetah owner - handlebar issue.

[Markstudy]

I've tightened the handlebars as tight as possible and they are fine when riding but slip if I put my weight on them getting off bike. Any suggestions would be most appreciated. Major concern is losing control in an emergency, the teeth etched in bar to prevent slippage are very fine, is there some way to get a stronger fit?

 

[Markstudy]

Update, had a mobile bike service come out to the house. 4 screws were tight but plate wasn't seated perfectly flush. No matter how tight screws got there was still play that didn't keep handle bars from moving if I put all my weight on them during emergency stop or getting off bike and leaning on handelbars. Fixed now but worth a note if anyone else runs into this.