with 1:09 sprint- and 1:45 cruising-pace (both impressing, first even more) no matter what you think, there must be a bunch of goodies in your stroke, and as Tom wrote, it might be a weird thing to brake your stroke down and build up again to TI-like.
I'd recommend to get in contact with mastercoach Mat
. He has a three-months 100m-sprint plan
in his Dojo. Additionally you should buy one of Terry's fundamental-courses and then alternate a pooltime with pure TI-drills to get familiar with them and the other with Mat's 100m-sequenzes.
Keep your enjoyment! Best regards,