Usually when there is a hot slow crank concern, it is within an electrical motor winding or bad armature. The electrical component expands when hot and requires more amperage to turn over. You might try attaching an ampere gauge to the positive starter lead to check and compare hot to cold crank amperage draw readings. If the hot readings are significantly higher than cold readings, I suspect you have a faulty replacement starter. If you are using a "rebuilt" starter, I would suggest purchasing a higher quality rebuilt or a new starter.
'98 Gulf Stream Sunsport 325, 7.5L Banks Power Pack, Koni FSD's, Air Bags, ReadyBrute Elite,
2000 Honda Accord