but i remember most important think they have different plugs because the things you mentioned run plug on different temperatures . in my theory if you place orignal size plug in your delux you will be able to touch 110 with 14t and 4th gear .
PAST EXPERIENCE this theory was completely working on delux 2010 model with 5 gears at year 2014 nothing was altered or repaired in 2014 it was all genuine .
plus same model 2010 with 5 gears was purchased brand new had same speed . in 2019 near me nobody have delux so i cant give you live example .
something making your machine slower.