Your blade choices kind of baffle me. Yes, if you are using a blade with reverse teeth, cutting 3/4" pine is tough especially with smaller blades.
And given the shapes have no difficult corners, using a smaller blade not really needed st least for me. I would have been using #5 skip tooth blade such as FD Polar. IMHO you can make it easier on yourself by using a skip tooth blade on thick pine. They will cut easier requiring less pushing on the piece and clear sticky saw dust better.