they're the sidas flashfit type, normally they are moulded with the special flashfit box
if you need arch support i'm not sure that trying to mould in-shoe will work properly, the arches will collapse and footbeds probably set in a position giving little or no support, you may be able to cut some hard foam to fit under them and hold them in the correct position while moulding
i have some moulded in-store with the flashfit box, they are ok but i found the esoles efit worked much better for me and were also more comfortable on long rides
Hello in my opinion the best way is to mold them in the shoe , becaus it s supose to fill the existing gap , i think if you mold them outside the shoes that will not seat properly on the soil of the shoe(they are all diferent) ; and secondly if you mould them outside of the shoe if you have a gap in between your moldind and the Inside of the shoe the Inside soil will probably colapsed Under the load like you said.
Of course during the molding in the shoe i will not apply much pressure on the soil like that my arch will not deformate Under load.
Anyway i will receive the soil on TUESDAY i ll keep you up to date about it , thanks for your help.