Should I go for bigger caliber suppressor to put in front of Hatsan QE?

I want to buy a suppressor a Hatsan QE .25cal, should I buy a .25cal or a .30cal suppressor? Since it will be placed quite far from the barrels exit...
I used a DonnyFL fatboy2.0 on a bullboss .25 and clipped the internal baffle somehow. According to DonnyFL the factory QE baffles need to be installed for it to work properly.
 
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