To add more categories, you should not use "Categories==list(97,100)", because that required BOTH categories to be in the cart (i.e. the categories list must be exactly 97 and 100). Rather, you need to check whether the categories list contains only categories 97 and 100 (not neccessarily both):
name=Seeds only; Condition=contains_only(Categories, 97, 100); Shipping=7
Please notice the "Condition=", because otherwise the plugin might fail to detect the contains_only call as a condition...
Best regards,
Reinhold