CGT mitigation between IPDI and Life Tenants estate

H died 2021. Will created an IPDI for W in his 1/2 of the house. W died within 2 years.
Remainder was to a DT but appointed out to the two daughters.

Ws Will creates DT (to be appointed out).

Prop sale agreed £22,500 over Probate Value (gain shared between daughters and Ws estate). Net gain will be approx. £15,000.

£7,500 gain with 2 daughters so within their CGT allowances.

In respect of Ws share of the property, I am considering appointing 25% of Ws half to the daughters with the remaining 75% to stay in the estate with aim that no CGT payable in respect of Ws estate.

Is my thinking right and/or is there anything else I should be considering?