Any recommendations !!!

My JR ergo 30 SS with a webra 32 ringed engine has the following settings,

Throttle Curve:
L-0
1-40%
2-70%
3-85%
4-100%

My pitch is set from -2 to 9 , with 4.5 to 4.8 at mid stick , close to JR's recommendations,

The issue here is that I feel that the mid stick throttle curve setting is too high at 70 % , anything lower then 65% , I battle to lift off the ground , JR's recommend mid stick is 50% throttle , How can I achieve a 50% throttle setting at mid stick to hover / lift off the ground,
I am still using my training gear / pods , is this the reason that I need to have a higher throttle , to overcome the extra weight ?

Will a tunned pipe help ??
Needle settings ??
Get an OS 32 engine ?