Raising Doka suspension... Larger springs?

[mrnickmuss]

After a rather complicated journey 'unslamming' my Doka (my wife needed a sports bra to go to the shops on our bumpy Devon roads) I got rid of the wide boy wheels and selected the 'right' wheels and tyres to provide much needed clearance by putting standard springs front and back with new shocks, Merc rims and larger Tyres. Which I was assured would fit, I was happy with the choice, except the tyres rub at the top of the wheel arches occasionally when loaded or going down hill round corners.
Short of taking a panel beating kit to the arches What are my options?
What springs are there available to give me a bit more hight?
Any suggestions appreciated!

[Oldiebut goodie]

Pictures of your missus going to the shops required to enable us to answer with great fervour and insight!