Re: Looking to switch from aerogel 300
every manufacturer will make an equivalent frame to the aerogel 300, so it may be worth looking at a few of those, such as the microgel radical or babolat pure storm.
or, you could look at rackets such as the microgel radical tour and microgel extreme pro. both are slightly larger headsizes (100sq inch as opposed to 98sq inch) but they are also a bit heavier, though not as heavy as the aerogel 200 or kblade tour. they also have the open string pattern it seems you favour