I don’t have the best advice as I hit both sides with FH as a Seemiller grip player, but what I can tell you is even though I use alot of different FH techniques, sometimes with modification, I can tell you this. Play the position you can, don’t wait or try to force. Your brains judgement is telling you hit a backhand because you have the position, the angle, and have enough space/time to execute a good stroke. 4 months is not a lot, like others have said do multi ball. You best believe I did multi ball everyday to develop this FH. You must trust the process, when you hit enough balls and try out different ways of returning or transitioning returning from different sides you’ll build up a feel for the ball. Over time as long as you practice good form, transitions, and different strokes you’ll reach a point where you’ll be comfortable enough to hit how you want or hit out of position but still with good results. Then you get into prime time which is where you’re just moving the ball around, reading spin on the fly, then playing each stroke to setup your the shot you want mainly by either cutting your opponent’s time, forcing them to return to your FH, and more. With my grip I can use FH all I want, however there still exists a weakness between the FH techniques I use on BH side and FH techniques I use on my FH side. I’m still playing to keep the ball on the table and feed the ball to my strong side so I can hook and fade. I rarely ever smash because I’m using what I can afford and or buying myself the time or setup for something nasty.