Urgent bounce flash question 760D owners

I have a 760D and have used the flash quite a bit...some direct and some bounce.  I have not had an issue.

Are you using a Canon flash?  I have a 430II and have paid a premium for the Canon brand and with the expectation that it will work reliably with any Canon camera now or in the future.

As mentioned, I would avoid evaluative metering.  In fact that is one of the first changes I made to the default 760D settings.  I prefer center weighted.  Of course, there is no such thing as set and forget.  With the flash I use flash compensation depending on the specific image.  This is usually just an issue of fine tuning.  Unfortunately Canon sensors have limited dynamic ranges so an accurate exposure is important.  With a Sony/Nikon sensor, I would probably just set and forget and then adjust in post.  With a bit of experience it is easy to look at the brightness in the center of the image and to predict what the camera will do and what if any adjustment might be needed.  Worst case, you might have the time to shoot, check the histogram, adjust and reshoot.  I rarely have the opportunity to reshoot.  So I work to get the exposure correct the first time.  When shooting flash, I often need to make changes that alter the balance of flash and ambient lighting.  That can mean substantial changes in ISO so fine tuning the exposure is just one issue.  I guess what I am saying is you need to understand how your camera will operate and to take control.

I know nothing about a 70D.  I have no idea if there is an issue with metering for flash.  I really doubt that is the case.  I have a T3i and formerly an XSi.  Those cameras also worked reliably with flash metering.