I think you'd find it more comfortable to retrim the elevator to give level flight, or just a very slight dive, whilst upright.
Then, if necessary, adjust the c.of g. to give just a slight dive whilst inverted---or,better, the model holds a 45 upline after a half roll to inverted,with no tendency to drop its nose after the half roll.
(This is assuming that you've set the engine downthrust to give a straight vertical power-on climb).
With most modern designs, with the decalage set so that the wing is 1/4 to 1/2 degree positive relative to the tail, the power-off downline will then show a small tendency to pull to the canopy, if you've set it up as above.
So,then, you can use a small percentage of down elevator-to-low-throttle mix (typically just one or two percent) to get the downline straight.
You won't notice it flying level at low power(landing approach for example), and it feels a lot easier than constantly having to hold up in at all power settings during level upright flight.

The upline on power is straight up or near enough. I'll try and move the C.G back slightly, last resort will be to adjust the tail incidence.

cheers Anthony