Find one offer provider that will answer and award tokens and stick with them.

Take screenshots along the way, learn which types of offers simply won't reward you, and accept that it is what it is (a bit of extra work and frustration).

You get the offers you get, you're right it depends on providers and demographics. Trying to "change" things can get you banned, vis-a-vis IP spoofing or VPN.

I do recommend dl"ing the MyTapjoy app, helpful to track which offers you have attempted.