Yeah if you decide to meld only 16 VIT instead of 20/21 you might want to reconsider. Giving up 5 Vit per accessory (for a miniscule tradeoff of 6 Det or 9 Crit/Acc at best) its probably not really worth it.
Stats of 5 accessories with 16 VIT melded:
90 STR
80 VIT
Additional 30 Det at best (~10 STR worth)
Stats of 4 accessories with full VIT + 1 Slaying:
95 STR
84 VIT
The stats end up being just about equal and you save yourself 1 whole pentamelded accessory. You also get more flexbility by being able to choose the Slaying accessory you want to use.
