WOW!! only 5K rpms max, that is not enough, Check the weights in your VARIATOR and weigh them I bet they are on the heavy side.
You can get more rpms by just going to lighter weights.
Heavier weights will lower your RPMS.
Lighter weights will raise your RPMS.
ROLLERS: For every gram you go up or down from your current weights your RPMS will change by 500-600.
SLIDERS: For every gram you go up or down from your current
weights your RPMS will change by 200-350.
So for example: Currently your max RPMS are 5K:
If your current weights are say 23grams and you get 20gram weights you will pick up 1500 rpms
so now your max rpms will be 6500K.
Just checked the specs on your trike and it makes its max hp at 6500 rpms so your 1500 rpms low.
What you want to do is get weights that will get close to that 6500 rpms range. So if it only is going to 5k you can get 2 and 3 gram lighter weights.
If putting in all say 20 gram weights from 23 and it appears to much you can then put half of the lighter ones and half of the heavier ones to lower the rpms a bit, So they won't go to waste.
Alleyoop