Apologies if this is a long winded post!
I Could really do with some advice from the very experienced surfers on a board. I've surfed for 20 years on and off but have just got back in the water after 3 years with a serious injury. I've been out 4 or 5 times and even in small waves it's been tough water fitness wise. I would class my ability as lower intermediate at best and still need a lot of work on turns and face carving.
I want a board for 1-4 ft waves beach break poorish quality stuff

I've always had between a 6'3 and 6'6 but since I've been out of the water things just seemed to have changed equipment wise and I'm struggling to know what to buy so I can progress as a weekend at best now older surfer.
I'm fortunate enough to be able to rent a few custom boards from a decent shop although they are old shapes and have been using a 6'6 Webber Afterburner which is ok and has a feel I'm used to. It wasn't great catching waves though at 1-3 ft which is what I need! I've also taken a McTavish tri-fin fish out last weekend which feels a little boyant/strange but paddles well at 6'2 but I struggle with duck diving a little due the the extra volume through the board and nose with flat rocker. First time out I went with one of the newer style higher volume short boards but didn't get on with it at all even though at 6 ft but that could be me struggling to catch waves with my water fitness being very poor.
I'd rather not spend a huge amount with the usage limit it will get but my local shop has 2 old stock new boards at a huge discount. A traditional Aloha similar to the Webber and a Walden CD4 measure 6'2 which I think maybe the ticket but I'm concerned with it being a long/short hybrid even though fairly short it will be really tough to duck dive. Both are around 37 litres and I'm only 65 kilos.
I'm open to other ideas but haven't the time to waste on a bad choice. The priority is duck diving and catching a high number of small waves to work on basic manoeuvres really.
All advice greatly appreciated.