prop help
 

Hey guys i need some help here!Igot 1988 25FT beachcraft with
502 425hp.this a deep v hull and dosent want to plain well with 4 people in it.Im turning 5300rpm wot at 63mph with two
people in it.The boat used to have a 7.4 330hp and ran the same speed?ITS LIKE WHAT THE HELL!! Today i tried a 21
4blade and it sucked 5500rpm at 55mph at 3/4 open.
i tried a 21 mirage plus off a baja outlaw it worked great,
so i bought one and didnt work the same...my hands are tied
any good advice would help..thanks randy...