The only reason I bought BTT is cuz I just want to change the action of the 3 finger swipe from whole windows to tabs.
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Go to System Preferences → Trackpad → More Gestures and change the "Swipe between Full screen apps" to four fingers. Or turn it off if you want some personalized action with BTT for that.
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Inside BTT, create a "Conditional Activation Group" (see Screenshot) and set it up with "Any of the following true" and always "App Name" + "is" + "Your exact App name".
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Create a four finger swipe and give it as association "Send keyboard shortcut" ⌃⇥ (for next tab). The second four finger slide should get a ⌃⇧⇥ action. Too lazy to do it twice, here's what the first action should look like.
This presumes that all apps you want to use it for support this keyboard shortcut to switch tabs. For those which don't you'll have to create an App Specific Action setting the appropriate Shortcut.
In order to create a new gesture to swipe through fullscreen (deactivated in Step 1.) make sure you create it in the "All Apps" section of BTT, not inside the Conditional Activation Group 
Hope this helps 
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for educational purposes, what is a conditional activation group and what does it do?
That's a group of actions that is only active when some predefined conditions match. Document names, Window names, connected Wifi, running background process,… It allows you to have gestures etc that will only work once these conditions are fulfilled.
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Are these steps still the same to get chrome tab swiping to work? I did get it working but I want to do it in the most efficient way. Is it necessary to do the conditional activity? Or can I just do it on the google chrome app?
I've got it working but I have to really swipe hard. Is there any way to get it to be more sensitive so I don't have to force swipe?
I'm newer to the tool, using the trial to see if I want to purchase. I would buy it for this exact swipe action.
Thanks!
