I can honestly say I've never seen a melted contact tip in 40yrs of welding. You can stick the wire to the tip if your too close to the molten puddle that will require tip replacement most of the time, 99%.
The tip can be ground off and be reused when this happens. Only when working for my self, chuck them if working for someone as it's cheaper than labor.
Forget recomended wire speed settings. Use the chart to set the voltage then on a scrap piece while holding the tip about 1/4" to 3/8" away and a "steady" distance, start an arc then adjust wire speed to sound just like bacon frying. This allows for any tip, liner or roll slipage and is the most accurate method.
I like my tip even with the cup end but a tip thats extended upto 1/4" past cup end also works well for some applications. Too far out then you can cause porosity with-in the weld with tip life being short.