I like #10 and #11 best.
Regarding #10 – I’d delete “You’re working too hard” – I feel it’s too generic and it just means that it takes longer for readers to get your key points. “Utilize” can be simplified to “use” and you can attract more attention by adding an adjective to power.
I like your addition of fun in #8 because a lot of people think that research is boring.
How to Use the Heroic Power of Research to Make Your Copywriting Easy, Fun, and Higher-Converting
The only problem I still see is that it’s not copywriting but your copy that becomes higher-converting. So perhaps:
How to Use the Heroic Power of Research to Save Time and Have Fun When Copywriting
Regarding #11. You could arouse a little more curiosity:
The Simple Trick That Makes Copywriting More Enjoyable While Doubling Conversion
Can this simple trick make your copywriting more enjoyable and double your conversions?
It’s great if you can be specific about doubling converstions (or a percentage like 103% would attract even more attention). But either way you would need to serve up some proof about growth in conversions.
Enchant readers. Woo customers. Win business.