weight reduction and gel-butt options - concerns

[curious_person]

so, I heard that weight reduction (for TPE) was like gel
I've had problems with TPE dolls with gel-breasts sagging.

i'm worried that both the weight reduction generally and gel-butt in particular might make for a less durable doll, that loses shape eventually, especially if left on the bed
(with the previous TPE dolls i was able to leave them on the bed ready for action most of the time)

any advice on this?

i've dealt with WM dolls in the 38-44kg range. The starpery dolls i'm interested in are listed at the upper end of that weight range (172F and 174D)... so I know what to expect, i've been able to enjoy my 41kg & 44kg dolls.