Do lazy eights and just extend the outside portion a bit longer each time. It will become easy after enough tries.
Once you can ' feel ' its steady thru the eight , you stretch it a way each time , out to 1/4 lap , then half , eventually one then two .
As your into the ' down for up 'your swing it the right way & the right mindset to swing the arm , to bring her ' up ' inverted .
You want maybe a little noseweight if its touchy / toey on the controls . A Combat Streamer steadies & is visually good . As seeing the plane helps >
The BACKGROUND & plane dissapearing can be a problem . You can see it easier in a Big Field , often . TREES tend to hide it , if theres a belt of them .
AND the plane should ' hang out there ' you dont want the lines going loose .
LAZY EIGHT is where you go DOWNHILL in the middle - this is easier on the aeroplane . ( UPHILL in the middle of the eight it slows down more - needs more power )
Wondered if maybe it was ' loose ' inverted ( warp / tip weight etc )
SO youd do a loop then as it goes DOWN pull around into a outside loop - up - over - down - into inside loop ( on left - outside on your right )
So the downhill is where you stretch it - it keeps up the speed .
EXTRA tip weight isnt going to hurt , the IMPORTANT THING is to have control - tight lines . Not loose ones , anyway .
Another THING is SOFT GROUND . long grass , watered field , drained swamp . Not hard sun baked clay or ' hard top ' , unless your born lucky .