There is nothing wrong with mameluk frame delay, it is lower than the one of mangudai.
I also think camels are too strong vs mamelukes. Maybe the anti Mameluke bonus can be reduced or completely removed from them, otherwise mamelukes are useless in teamgames.
The rest is not pointed at you.
We had a lenghty discussion about mamelukes here a couple of months ago and i think in the end most agreed thay a slight (i proposes +5f - 10g) cost reduction would be fair and enoigh. That could make them viable in 1v1s, so ita okay they are pretty useless in team games.