Hi, MamaBear76,
Is your son low tone/hypermobile aswell? My son is definitely low toned (hypotonic) and hypermobile. I suspect he is also dyspraxic, as his motor planning is poor (I had to teach him how to roll over, crawl, pull to stand, walk, climb playground equipment, dress and undress, unwrap presents and the foil around his sandwiches, etc, etc) and although many of his motor issues could be explained by the hypermobility and his personality, I'm quite sure that, eg, problems unwrapping sandwiches are not the result of a purely physical issue! Hypotonia and/or hypermobility frequently go hand in hand with dyspraxia.
Anyway, things that were advised to us to help with the low tone (which results in, eg, poor pencil grip) and hypermobility and therefore would probably help generally with dyspraxia are: trampolining; writing/scribbling on a blackboard and/or painting standing up or kneeling on the floor with the paper against the wall, as this helps with shoulder stability (and hip stability if kneeling); holding several coins in one hand and manipulating them one at a time into your fingers to post through a slot in a box; trying to pull a coin out of the middle of a ball of plasticine or playdough, etc. And the big, triangular pencils also help my son hugely - he just can't get a good grip on normal pens and pencils. Oh, and wheelbarrow walking is also supposed to be good for building up shoulder stability, which is essential for good fine motor skills, as is playing floor games (eg giant snakes and ladders game, jumbo jigsaw puzzles) or anything that encourages your child to go onto all fours on the floor and balance his body weight onto his shoulders and hips. Presumably, soft play areas are also therefore a good idea!
My son has never had a problem forming his letters correctly (if not neatly), as he has always had a fascination with letters and numbers (and is really quite gifted at reading and with maths). I suspect, however, that he was helped in this by the Finger Phonics books (part of the Jolly Phonics series) - they have large indented letters for you to trace with your fingers, which is why we got them for him, as we were also told that dyspraxic children may learn more easily if they are given more tactile feedback, hence having the letters that they can feel as they trace them, rather than trying to copy something just by looking at it. Our ds used to spend hours tracing his fingers around the indented letters in the direction indicated and was able pretty rapidly to reproduce this on paper.
Anyway, hopefully some of that is helpful for you.