Hi there again Liam... I've been mulling over your smoking problem and just had another thought. I've just remembered about something I read on here sometime ago - you might want to check out the posting put on here about 12 months ago by RYAN24 about...... DIPETANE FUEL TREATMENT
Put this tag-line into the search box up in the corner of the forum page and you will get up the postings put on here about this fuel additive, and you'll see the comments by other members as well. Certainly worth taking a look.... Hope you're closer to getting it sorted... Cheers.. Robin