I'll fly this glider to get the feel of it then maybe down the line might get better one was actually looking at the mini dart 2 1m from hyperflight but not sure if smaller is better or worse then a 1.5m but a lot more expensive.
I have messed about with the different flight modes and a wee bit of up elevator when launching, I use a dx18 I managed to do a mix so when I press the bind button on the transmitter then I have a switch that I have the ailerons reflex a 1mm. I actually have a video from a few days ago but won't let me upload it here.
The flat pegs are a bit easier on the fingers but stick with the round one if it's OK for you. Don't worry about the servos sticking out, there will be a tiny bit more drag but it's not worth changing them.
If you want to move to the next step in DLGs, you will see a big performance increase.
As to flying, you will get your best flights on calmer, sunny days when thermals are easier to find. Get the model trimmed to glide a bit above stalling speed and try not to over control. Leave it alone as much as possible and watch its behaviour. Learn to read its reaction to air movements.
Get someone to take a video of you launching and flying if you want more advice. I used to get about 60-70 seconds from my Long Shot in still air when it was new. I was launching to 30-35 metres at best.