Congrats on the successful maiden.

Looked like you were fighting the aileron trim most of the flight. It appeared to need a few clicks of left trim. Looked like the elevator was a bit of a struggle as well.

First job on a maiden is to get the plane flying straight and level hands-off (or, more accurately, sticks neutral) with aileron and elevator trim, and then pull a long vertical and check the rudder trim.

The engine seemed to be putting out good smoke, which is what you want on a new 4-stroker. Can't comment on the low end, but it takes a while to 'sneak up' on a low idle setting on a 4-stroke. Good choice of fuel.

The clanking might've been your wheels (mains or tail).