Too hot to Handle

Below is a chart of eight cast iron pans that I have purchased for my kitchen research and they are now in my designers "cast iron skillet" collection. This has been 30 years in the making and has provided excellent material allowing the discovery of breakthrough design.

Each pan has one column charting the temperature of the pan cooking surface and one column charting the heating of the handle in the area a two handed grip might experience. 
60C has been taken as the red line denoting the human pain threshold. 
200C has been taken as an acceptable pan surface temperature to commence cooking. 
Green denotes an "unripe" cooking surface. 
Pink denotes the arrival time of an adequately heated pan. 
Reference the master time axis on the left to discover the effectiveness of the pan and handle. 
Red denotes a temperature beyond the human pain threshold. 
Some pans heat up quickly, some pans are impossibly slow. 

Only pans with relatively long removable handles such as the Japanese Oigen Foundry quirky "24cm Oyaji-no-Teppanyaki Literally a cast iron grill plate for middle aged men" produce a satisfactory heat profile. 
The range of Element Cookware models also successfully deals with this syndrome of dangerously hot handles, eliminating a very old cast iron problem.

  

Manufacturer USA Le Chasseur Slow Heating Pan Oigen Element Element Element Element
Pan Size 10.5inch 30.0cm 24.0cm 24.0cm 26.4cm 26.0cm 29.4cm 29.4cm
Pan Type Flat Skillet Crepe Pan Deep Fry Pan Teppanyaki E1 E2 E3 E4
Pan Weight 1.84 KG 2.28 KG 2.48 KG 1.5 KG 2.2 KG 2.33 KG 3.14 KG 3.11 KG
Handle Length 120mm 120mm 220mm 250mm 250mm 250mm 250mm 250mm
Minutes Pan Temp Handle Temp Pan Temp Handle Temp Pan Temp Handle Temp Pan Temp Handle Temp Pan Temp Handle Temp Pan Temp Handle Temp Pan Temp Handle Temp Pan Temp Handle Temp
Start 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
1 min 135 33 130 28 71 23 144 22 101 20 89 21 89 21 85 21
2 min 164 48 167 47 103 25 209 29 157 21 151 22 148 22 145 22
3 min 205 70 214 69 137 28 237 35 178 22 195 23 178 22 190 23
4 min 245 85 248 96 170 32 252 38 252 23 224 23 205 22 222 24
5 min 272 114 269 101 186 36 279 45 265 26 249 25 235 23 239 25
6 min 300 119 293 128 198 45 319 48 296 28 270 27 260 25 263 25
7 min 320 132 305 148 210 61 326 49 309 32 284 31 272 25 285 27
8 min 328 138 312 149 220 65 329 58 313 32 299 34 280 27 288 27
9 min 335 155 332 150 222 71 334 62 322 34 320 35 290 29 302 29
10 min 343 168 348 165 225 81 336 65 322 36 326 36 306 32 319 31
11 min 349 175 357 180 240 84 336 66 324 40 327 42 317 34 320 34
12 min 353 191 356 195 262 96 338 69 326 42 338 44 320 34 320 35