@hooj That must be quite an old system given that you're getting 60p per kWh. You've also shown the worst six months of the year, between now and September you'll earn very nicely out of it. There are two parts to FITS payments, the 60p which is paid for every single kWh you generate, and the export payment, the 4.25p. You are on 50% deemed export. If you move to an Octopus export tariff you will still get the 60p generation payments, but the deemed export payments will be replaced by metered export payments paid at whatever rate the tariff pays.
You probably want to consider getting an AC connected battery - fur further info look at this thread.
You probably want to consider getting an AC connected battery - fur further info look at this thread.