this can't be over stated.
There is no let off with a traditional bow, plus you'll need to develop a different and vastly quicker shot sequence from target acquisition to coming to full draw, anchor and release. Last thing you want when developing those skills is fighting the bow weight, which will lead to target panic and only add frustration, extending the time it takes to become fluid and accurate. At this stage there should be zero consideration for hunting weight and effectiveness.
I would suggest getting one of those Black Hunter recurves or longbows with 35 or 40lb limbs and develop your form with that, then upgrade to heavier limbs when you're ready. They are really good bows, esp for a $100. I picked one up about a month ago for just this reason, to work on form in the off season. Shooting trad is a lot like working on a golf swing in that it requires technique and practice until it becomes second nature, but you will always need to practice to stay tuned up so to speak.