Hey Matt,
84* is likely the exhaust opening time ATDC and if accurate would equal 192* of ex duration - which is substantial. It's definitely going to favor upper rpm's for where the power is. I'm not sure what 114 is. Transfer durations for a ported cylinder are often around 122 for example.

In general, the more port duration (time open) the more the engine is intended to run at higher rpm (generally speaking). There is more to engine building than port timing however - a lot more. But if you go about attempting to change the engine raising ports, the transfers are the most tricky by far, especially if you raise them more than a couple degrees. The angles are precisely aligned with the opposing charge and being careless or not having the ability to measure the angles means lost scavenging efficiency. A solid amount of theory coupled with a strong ability to work with hand tools are the basic prerequisites for attempting to port a cylinder.

Having said that bottom end engines may run around low 180's for ex duration and maybe around 120 for transfer - top end around 194* with 130* transfer. Like I said before though, there is an almost blinding amount more you can do to an engine to make it run it's best for an intended application than port timing, but port timing is a basic that can't be overlooked either.

Hey sorry for the late reply. Compression definitely increases power. Milling the head isn't so much applicable here as it would be probably on a 4stroke, but "milling" the head is a way to increase the power here too. The real power in head modifications is in combustion chamber shape and squish dimensions. The stock TRX cylinder needs to be decked about 1mm as well. Dome size will depend on bore size. The figure I use is uncorrected compression ratio taking into account the stroke and compressed space at TDC. You can run about 14:1 for a decent bump and run around 100 octane. It's a nice middle ground number, but the number you want for yourself is depend on how you ride and your fuel budget, among other things.

Tell your 4stroke loving friends that if their engines were so great, why do they have to be bigger and use more parts to be more powerful than a 250cc 2stroke if they're so advanced. haha.