I think you need some more and better slide maps for your server.
I made a pack with these 13 maps:
re_sliderace_fix
re_sliderace_v2_b6_2009
sliderace_499_ecm_f8
sliderace_city_ecm
slidrace_core_fix
sliderace_destiny
sliderace_emotions_f2
sliderace_orange
sliderace_verywet_v3
slide_icyrun_beta
slide_icy_caverns
slide_tara_v5
sliderace_speedrace_v4_1v1_fix
outdated maps:
speedrace_v4
sliderace_city
re_slide_race_oon
sliderace_neon
sliderace_fusion
sliderace_flow
Please restrict all weapons except knife, smoke and flash. You dont want to have a pistol or rifle on slide.
Also you should change the sv_airaccelerate to 150.