Garcinia xanthochymus ,charichuela,Rheedia aristata those are slow but seeds matter.Rheedia aristata vari alot between seedlings as do charichuela grafting on rootstocks can be tricky with different species.Example some aristata I planted same time have 1.5 inch caliper others over 8 inch and it is a male sorry oscar you might have to graft female on that sucker .I know you want seed production,not much of a fruit to eat.
Garcinia xanthochymus slower than mangosteen but steady so they do get good size after 20 years 16 feet ,Miracle fruit over 10 feet ,those get planted every where by the birds
Alupag 16 feet 20 years those are slow.Sometimes environmental factors come in to play climate ,nematodes,or planting near suppressor trees like melaleuca allelopathy