@djdodson .... Hi and welcome to Vaping Underground
I don't know how long you've been vaping but this place is a treasure chest of vaping information...hope you kick up your feet and stay awhile...everyone here for the most part is friendly and nice and always willing to help
Now onto your question....you say you're getting a burnt bad taste at 40 to 60 watts but that's where you like it around? What other tanks or drippers have you vaped so I have a better idea of where you're coming from to help you better? And also what resistance is the coil you're using in your tank? Usually for those higher wattages you need the .2 ohm coil instead of the .5 ohm coil. The lower one is meant for higher wattages up above 50 watts where you say you like it and will probably have a much more enjoyable vaping experience with them....from what little you've given me to go on it sounds like you've got a .5 ohm coil and are turning it up to high and it's burning up giving you a bad taste. Different coils have different resistance levels to allow difference ranges of wattage. typically with all sub ohm tanks the lower the resistance the higher you can turn up the wattage. I would check the coil you are currently using as it should have it's resistance printed somewhere on it and if it's a .5 I would assume at this point it's fried and you'll never get a good taste out of it and just toss it. Then I would order some .2 ohm coils for your tank and try those at that higher wattage you like making sure you prime them well before first use.
You prime a coil like that by dripping a drop of juice on each of the juice inlet ports on the sides of the coil assembly and a little bit around the inside of the top but making sure you get none down the center. If you get juice down the center it will cause your vape to gurgle and spit more. Once you've primed your coil I would screw it into the tank base and put the tank together making sure its full, but not overfull the first time, of liquid and turn it right side up and let it sit for four or five minutes...yes I know how much waiting to vape a fresh tank sucks but to help make sure your coil is good to go makes it all worth it. After those few minutes I would fire it up and give it a try and see how she vapes and if that solves your problem for you.
I hope this helps....any more info or pictures you can give would be helpful in making sure I am on to the right thing. happy vaping and best of luck