@CarlaSun
My DS is in a similar situation.
As @Cakeandusername suggested we got FOIs from a number of places, as AStar/A/A PG is a bit tricky for Unis whose std offer is the same.
LNAT was out for DS.
Warwick, Durham and Bristol were all similar where the offer rate (for those PGs) was < 20% or a lot lower.
So, if you put 3 or more down of those types (just because you have the grades), you risk getting no offers at all (for that group).
But, conversely, the PGs (above) are good for AAA types. Offer rates were 98%+.
DS has gone for Warwick, Exeter, Leeds, Sheffield and Lancaster, and within 2 weeks had offers for the latter 4.
Really depends on which AAAs DC may put down as some, like Southampton, are likely to be in clearing and would accept lower on the day if it was the insurance. I.e. you don't need an AAB choice just to put as an insurance.
But, it may turn out that an AAB choice is higher up the preferred list than many AAAs.