Hi,
My suggestion is use Rogaine and ensure you use it everyday. I have been using generic minioxidil 5% for more than 5 years now and honestly I like applying it. I feel it adds some volume to my hair and I use it to style my hair also (may sound funny). The day I dont apply it I feel my hair is dull. Try rogaine for a couple of months and then move to finastride. May be rogaine helps you and you dont need to move to finastride...But dont delay...Also I really dont feel you will see any results in the first month. So use it religously for a couple of months and then see if it helps.
The thinning on your crown is similar to mine and I use Nanogen to cover it. Since its a small patch, my nanogen last for more than 3 months...
All the best and keep posting your results...
Regards,
Sandy