No don't raise it .... I had this exact prob when running ats cups. I have now fitted my borbets which are 16's and it never catches which tells me that you only need another half an inch ish of clearance and your downpipe won't hit the floor . I plan to remove my helper springs which will lower me another inch(ish) so to get round the downpipe issue I have brought some ice hockey pucks (cost £10) off eBay and had 20 mm holes drilled through the middle , the plan is to fit them underneath the engine mounts to raise the engine 1" ....this will then let me go lower without the catching issue. It will work for you too but if you remove your helpers you may start to catch again .....make sense? There's a guide on here for hokey pucks somewhere