Yea from the looks of the problems you have described, it seems to be a latency issue. 300 ping is actually quite bad, I've seen people with 200-300 ping have very delayed reactions or even teleporting. Try using WLAN Optimizer if using a wireless connection or TCP Optimizer if not to improve your connection.
If you are also having FPS problems try looking up an FPS config which involves editing SMNC's graphics settings via editing UnrealEngine3's INI files.
Well as a Brit, I think they're usually at 1AM, which means it's even later for most other Europeans. If the event was moved maybe 3-6 hours earlier, that'd help. Although I know that one time wouldn't suit everyone, so if you scheduled each session at a different time that might be good. Perhaps ask around, see when more people are available. For me it'd be ideal playing from 8pm GMT. Not sure what time zone you use or what time it'd be where you are, so here's a website so you can easily find out. http://www.timeanddate.com/worldclock/converter.html
I would like to see all the players that show up put into a randomizer (like this one) for the beginning of game nights. Then after a match or two reorganize teams to try to maximize team balance.
Fact is some players are better than others (no disrespect!) and I think that the most fun is had by everyone involved if our events are geared toward the best competition. Games that last 40 minutes are always more fun than those that last 10.
The down side of course being that some players involved in the SMNC group nights know each other on some levels, whether that's personally or just as gaming buddies. Of course they will want to play with one another. However isn't that what killed the previous SMNC Skill Play nights? Teams stacking hard and nobody wanting to play against them.
I think that if we can get a small community of dedicated players for our SMNC group, and then have those players whose skill is stronk spread as evenly as possible while encouraging a non-hating attitude, it could do wonders for our games.