It's not the pushrods getting oil to the top to the rockers that is the problem, it is the volume of oil in the gallery that feeds the lifters themselves, solid lifters require less oil volume and pressure so the updated cam bearings to feed the lifter gallery is the needed component. I don't think anything was damaged, but, it is actually the opposite, the solid lifter camshafts are usually more radical than the hydraulic cams, so the solid lifters on the hydraulic cam should work fine for a stock application. So basically, if you want to keep the hydraulic cam you have to pull the camshaft, remove the cam bearings and install the fully grooved bearings to feed the lifter gallery oil feed (no way around it), or simply install the solid lifters and pushrods, or if you really want to be safe, the solid cam and lifters and pushrods. In fact, installing oil feeding pushrods would make your situation worse, the problem is there isn't enough oil going to the lifter gallery oil rail to begin with and oil leaving the lifters extra would make the problem worse.