Not sure I understand your flying here. If you are making an approach to a high pinnicle surrounded by trees why do you wish to hover oge ?? If you need to indicates you cannot land so why put yourself in the avoid curve ??
If you can land you should not be worried about OGE what you should be worried about is your power check to get in and be able to get out again as i presume the area is a confined area
With a 300C generally you need 2" of MP for towering T/O and 6" to 7" mp for a landing. Do the power check straight and level with about 45 knts for landing.
Not sure on a CB has less guts than a C model. If in doubt please ask an experienced instructor to show you the limitations / power checks. Even if you find the OGE / IGE figures remember this is the absolute limit of the machine on a perfect day flown by a test pilot.
If in Doubt do not try it, it is better to be an old pilot than a bold pilot !!
Have a nice one