Found something
Nothing from the tech guy yet still waiting to hear from him / her, I may have a wonky propane line or as suggested a burner conversion problem.
I did find this on the internet from Energy Star Market & Industry Report as follows;
“Eco-Mode”  options  or  other  similar  settings can  save  energy  by  reducing  power  output  while  lengthening  the  drying  process  and/or  stopping the  dryer  before  clothes  are  completely  dry. Such settings may also incorporate a variable heat source. One manufacturer has noted a 40% dryer energy savings from using this energy efficient mode or cycle. However, recent testing by Ecova  (formally  Ecos  Consulting)  on  behalf  of  NRDC,  found  that  “eco  modes”  on  two  dryer  models provided no energy savings if clothes are dried to a similar level of dryness reached in other  modes.48  Ecova suggested  a  truly  energy-saving  “eco-mode”  could  be  accomplished  by  modulating the heater power and fan speed.
A lower heat setting can also improve energy efficiency and reduce energy consumption, since less energy use used to heat air, cloth and metal.  For example, Ecova testing for NRDC found a 13% difference in energy consumption between the highest and lowest heat settings for one clothes dryer model tested when drying the same load, at the expense of a 14-minute increase in drying time.
So as Jerrod6 replied about Energy Star Dryers and the 527 & 627  are rated as Star, it may explain why it takes longer to dry, it's the make -up of the machine and where they are going with appliances.
Yes the drum in my dryer is stainless. It's too bad they don't tell us this when buying new appliances, I'm beginning to believe it's more product ignorance on the supplier's part, or maybe as a consumer we need to ask more specific questions.