Ps, i got front and rear axle bungs you can have for a tenner plus post dude!
I've had a Tsubaki Gold X-Ring chain on mine for about 4 years now along with Renthal gold sprockets, 16/44 gearing. Coupled up with careful checks and adjustment when required and a Scotoiler its hardly stretched at all and the sprockets are exhibiting very little signs of wear.
Are you referring to Gen 2 bikes there steelman?. They were 16/40 stock straight from the crate whereas the Gen 1 was 17/42. Common mod on Gen 1 bikes is to drop 1 tooth on the front and increase 2 on the rear. Some folk drop 2 teeth on the front and go up 2 on the rear to go the 15/44 route.
With what you mention regarding going to 15/42 on the Gen 2, that's essentially the same as most do with the Gen 1 i.e. going -1 on the front and +2 on the rear.