The "best" writing speeds are kind of dependent on your drive. Normally 4x or 8x is used. However this isn't gospel. Some people will only write at 1x.
Does you game install and patch correctly from your original (not the copy). I have had a couple of games that come up with errors while installing from the originals. If so then the copies are doing this as well. So you truely have a 1:1 copy.
If not then you have got a bad copy. Could be either reading or writing. Try re-imaging and burning at say 4x and see what happens.
Oh. Just remembered something else. Are you using good media. If not get some. It makes a difference. If you don't know what your media is then take alook here.
On to EFM.
I think FP should answer this question. Taken from SafeDisc 2 Thread
IF YOUR WRITER'S NOT ON THE LIST
If you don't have one of the known safedisc 2 killers referred to above, you will not be able to copy the latest safedisc 2 protected games (e.g. MOHAA, C&C Renegade) without special measures and your chances of getting a perfect copy are limited.
If your writer is not one of those listed above as a safedisc 2 killer, it may, nevertheless, succeed in making a working copy by amplifying weak sectors when burning the image. This option is referred to in clonecd as AWS, in blindwrite as enhance weak sectors, in alcohol 120% as bypass efm errors, and in cdmate as SAM but is not available in burnatonce, fireburner, cdrwin or nero nor AFAIK in discjuggler (someone please correct me if I'm wrong about discjuggler). [IMPORTANT NOTE: If your writer is a known safedisc 2 killer, you should never use this option; a) it isn't necessary, and b) if you do, there is every chance you will get a coaster.]
However, you should note that there is no guarantee of success if amplifying weak sectors is necessary and results will vary from game to game and from writer to writer (even those of the same make, model and firmware) and, in the case of many writers will not work at all. You can but try, and, if it works, great; but, if it doesn't, don't be too disappointed.
And finally. A rough guide to what does what best.(ish)
Alcohol = SafeDisc, Starforce 1+2, SecuROM 4.85xx w/ emulation
Blindwrite = SecuROM 4.85xxx(perfect with Plex Premium)
CloneCD = SecuROM 4.85xxx(CloneCD + Twinpeaks + BWA), Laserlock, Ring Protech
Can't Do = StarForce 3, Tages