Stamp duty – I do object paying tax that I am not obliged to?

Can anyone help me out with a Stamp Duty question? I have spoken to mortgage advisors, solicitors and the HMRC and seem to get a different answer every time. Obviously, no one likes paying extra taxes, but it just seems so bloody complicated and I do object paying tax that I am not obliged to.

Here are two scenarios I am currently facing. Any suggestions would be appreciated.

Scenario 1
I own one residential property (my primary residence).
I subsequently purchase two rental properties (cost 290 and 330K) and pay 3% additional stamp duty on each property.
If I then sell my primary residential property within 3 years of buying rental properties (and not buying another residential property at that moment in time) would I be eligible to claim a refund of the additional 3% stamp duty on one of the rental properties (the higher cost one?).

Scenario 2
I rent out my one residential property.
I subsequently purchase two rental properties (and pay the additional 3% stamp duty on each).
I then buy another residential property and within three years I then sell my original residential property (which has been rented out).
Can I claim a refund on any of the proprieties that I have paid the additional 3% stamp duty on?

Thanks

Jon