I like what you have so far, you've used up the weight limit and made perfect component choices. First thing to suggest is moving your wheels to the very back of the bot, which should help with the ramp problem and allow you to get rid of the blue snapper. The chassis wedge should also be twice as shallow as it is now in order to help against horizontal spinners. Lastly I would make the flipping wedges longer, it's harder to get those big flips with a short wedge.
Hi sorry for the late reply.
Here is my updated robot:
Weight: 398.8 (+1.1)
I have made the wedge shallower and longer and the flippers longer too.
I've found it can self-right more reliably, so I didn't need the middle flipper and replaced it with a iron spike attached to extenders and a piston - so I can actually score points when immobilising an opponent isn't possible.
I also moved the wheels to the back like you advised and haven't had any problems with getting stuck so far.
Lastly, I added a front spike to add a little extra damage and get as close to the weight limit as possible.