I took the heel shift off my 1600, just didn't care for it, didn't get enough shift "feel" using it. My other road bikes are all BMW flat twins and I am so used to a toe shifter it just feels more natural to me. Now, there is a way to make any big twin shift better, quicker, more positively. Its all about maintaining engine momentum and preloading the shifter.
Big twins, whether thats a BMW flat twin or a Vulcan V-twin, they have big ol pistons and often a lot of heavy flywheel effect. Shifts go much better if you minimize any rpm drop through the shift. What I found works really well: 1. When you're ready to shift up, preload the shifter to take up any lever travel slack 2. Right when you do the shift, use maybe 1/4 of the clutch lever travel as you very briefly chop the throttle 3. Same time you do that move the shift lever and it'll click up into the next gear positively and accurately 4. Since you use the clutch to barely interrupt the power to the rear wheeland loose little engine rpm, the bike accelerates smoother and more quickly.
If when shifting you let the engine rpms drop too much the engine has to work harder to get back up to decent push for the higher gear. You only need the clutch just enough to slightly unload the power during the shift and that can be done with very little clutch lever travel. If during shifts your habit is to pull the clutch lever back to the grip you loose too much engine momentum during that split second.