There are several ways around it. If you like the EZ buy it with no worries. If you can't find an idea or anything I have a spring I can send you (compliments of StakeMan) and you can use it with some wire to "delay" the opening of the wastegate... giving you the boost level you seek.
If the EZ is the only thing your adding it is not an absolute requirement to "up the boost". Although its handy to lower the EGT's a bit.