There's literally no reason to outbid someone who paid the release clause unless you're offering in installments. In which case you're not paying the release clause you're just having a bid accepted.
There's no point offering more as the selling team have no say in accepting an offer once it matches the release clause.
Only reason to bid more is if you don't want to do it all up front and pay in installments instead like Chelsea are trying with Enzo Fernandez.