Ideally take photos of the transfer ports, from the base of the cylinder looking into the transfer's themselves.
Take photos of the ports (as best you can) from inside the cylinder, so we can see if the ports heights have been altered and to see what kind of chamfering has been done to the port edges.
Port width and port taper is also an aspect that would be of interest.
If you take about 12 photos from every different angle, you should be able to present enough information for those with some level of 2-stroke porting knowledge to work with.
A single cylinder engine (without balance shafts) can only be balanced to "minimise" vibration at a specific rpm zone, and as an end user you will have to determine which rpm zone is the preferred range that the engine is to be run. This in turn will determine the "balance factor", which will involve the use of maths.
The easiest way to reduce vibration is to reduce engine rpm. If you reduce normal max rpm, then you will need to increase torque to make up for lost power. Methods (and products) are available to boost the 2-stroke torque curve.
It's a win-win-win situation because vibration is reduced as well as reduction in noise as well as increased engine life through reduced rpm.