Mudguard Clearance

Not flogging loads of mudguards but...
Is there an optimum clearance for a front mudguard? Took the plunge and bought a front (& rear) mudguard. I've got a CX front fork & disc brake and there is a massive gap between the arch of the fork and the wheel - no problems with fitting then. But, even with the mudguard fitted to the maximum extension of the bracket, there is still 2 inches between the guard and the wheel. Obviously adjusted the bottom to make that the same all round.
To me it just doesn't look right and just want to ensure that its going to be effective.
(I have got a rear Bontrager NCS I'm not going to be using if someone is interested...)
Is there an optimum clearance for a front mudguard? Took the plunge and bought a front (& rear) mudguard. I've got a CX front fork & disc brake and there is a massive gap between the arch of the fork and the wheel - no problems with fitting then. But, even with the mudguard fitted to the maximum extension of the bracket, there is still 2 inches between the guard and the wheel. Obviously adjusted the bottom to make that the same all round.
To me it just doesn't look right and just want to ensure that its going to be effective.
(I have got a rear Bontrager NCS I'm not going to be using if someone is interested...)
1997 Gary Fisher Big Sur
2009 Scott Spark 60
2010 Ghost 5000
2011 Commencal Ramones AL1
2012 Commencal Meta AM1
2009 Scott Spark 60
2010 Ghost 5000
2011 Commencal Ramones AL1
2012 Commencal Meta AM1
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