Hi Parsly and welcome to the forum, it is "normal" for your readings to be quite a bit higher after eating than before so you must be doing something right, I would humbly suggest that you carry on with your diet and see if those reading start to drop slowly over time, the fact that they are close together, assuming they're less than .5 to 1 mmol/L apart and you are testing before eating and again 2 hours after finishing eating, then theres really not much more you can do.
Its always best to achieve a slow drop in blood glucose levels as that is kinder to your eyes which are susceptible to sudden drops in pressure behind the lens due to sudden drops in blood glucose levels.
But if things arent moving as quickly as you would like perhaps speak with your doctor and try an increase in medication that might kick start your levels to drop a little faster, you can always reduce your meds once there job is done :thumbup:
I would stress that I am just another diabetic with no medical knowledge.