For that loose feeling, there are several alternatives. One is a simple spring that a gentleman called Karsten developed (this is what I have right now)
https://forums.pelicanparts.com/porsche-911-technical-forum/1053247-915-stock-shifter-improvement-spring.html
A second is the Seine shifter which is another spring system but more sophisticated.
Then there are shifter replacements such as Wevo, J West, Numeric and possibly a couple more that add some form of spring system and a slick look but at a significant cost.
Reports on all of these are normally very positive.